Full Face Flange Gaskets
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1-1/2in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 5in OD
1-1/2in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 5in OD
Item #SH-FF-150
A 1-1/2 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. Pipe size is a name, not a measurement — 1-1/2 in. pipe is 1.900 in. across the outside, and the gasket bore is cut at 1-7/8 in., rounded to the nearest eighth as it is on all the small sizes.
Measure across your flange face — if it reads 5 in., this is your gasket.
- Fits pipe size — 1-1/2 in. nominal
- Outside diameter — 5 in. (matches the flange face)
- Bolt holes — 4, at 5/8 in.
- Bolt circle — 3-7/8 in.
- Bore — 1-7/8 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb steel and 125 lb cast iron flanges — Class 125 and Class 150 share the same bolt pattern, so one gasket covers both. A Class 300 flange is wider on a different bolt circle and takes a different gasket. Red rubber (SBR) suits water, brine, air and low-pressure service; for oil, fuel, solvents or acids ask for Buna, Viton, EPDM or non-asbestos.
Where a 1-1/2 in. goes. Small circulators and booster pumps, pool and spa equipment, HVAC coil and branch connections, filter and valve manifolds. Below 2 in. most pipe runs are threaded or unioned rather than flanged, so a 1-1/2 in. flange is usually an equipment connection — a pump casing, strainer or valve body — rather than a length of pipe. It is also the first size down to 5/8 in. bolts instead of 3/4 in.
Flanging up a whole pump?The suction flange is normally a size or two bigger than the discharge, so a 1-1/2in rarely goes in on its own.
- 2in Full Face Flange Gasket — 6in OD, 4 bolt holes at 3/4in
- 2-1/2in Full Face Flange Gasket — 7in OD, 4 bolt holes at 3/4in
Need another size, a different thickness or Buna, Viton, EPDM or neoprene? We cut the full range 1-1/4in to 12in — call or text 561-414-1046 with your flange dimensions.
1-1/4in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 4-5/8in OD
1-1/4in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 4-5/8in OD
Item #SH-FF-125
A 1-1/4 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. Pipe size is a name, not a measurement — 1-1/4 in. pipe is 1.660 in. across the outside, and the gasket bore is cut at 1-5/8 in., rounded to the nearest eighth as it is on all the small sizes.
Measure across your flange face — if it reads 4-5/8 in., this is your gasket.
- Fits pipe size — 1-1/4 in. nominal
- Outside diameter — 4-5/8 in. (matches the flange face)
- Bolt holes — 4, at 5/8 in.
- Bolt circle — 3-1/2 in.
- Bore — 1-5/8 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb steel and 125 lb cast iron flanges — Class 125 and Class 150 share the same bolt pattern, so one gasket covers both. A Class 300 flange is wider on a different bolt circle and takes a different gasket. Red rubber (SBR) suits water, brine, air and low-pressure service; for oil, fuel, solvents or acids ask for Buna, Viton, EPDM or non-asbestos.
Where a 1-1/4 in. goes. The smallest flange size we stock — small circulators, equipment and instrument connections, bypass lines, and compact strainer and filter bodies. Easy to confuse with the 1-1/2 in.: both carry four 5/8 in. bolts, and the only real difference is the outside diameter, 4-5/8 in. against 5 in. If you are between the two, measure the flange face rather than counting holes.
Flanging up a whole pump?The suction flange is normally a size or two bigger than the discharge, so a 1-1/4in rarely goes in on its own.
- 1-1/2in Full Face Flange Gasket — 5in OD, 4 bolt holes at 5/8in
- 2in Full Face Flange Gasket — 6in OD, 4 bolt holes at 3/4in
Need another size, a different thickness or Buna, Viton, EPDM or neoprene? We cut the full range 1-1/4in to 12in — call or text 561-414-1046 with your flange dimensions.
10in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 16in OD
10in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 16in OD
Item #SH-FF-1000
A 10 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. Pipe size is a name, not a measurement — 10 in. pipe is 10-3/4 in. across the outside, which is why the bore reads 10-3/4 in. and the outer edge 16 in.
Measure across your flange face — if it reads 16 in., this is your gasket.
- Fits pipe size — 10 in. nominal
- Outside diameter — 16 in. (matches the flange face)
- Bolt holes — 12, at 1 in.
- Bolt circle — 14-1/4 in.
- Bore — 10-3/4 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb steel and 125 lb cast iron flanges — Class 125 and Class 150 share the same bolt pattern, so one gasket covers both. A Class 300 flange is wider on a different bolt circle and takes a different gasket. Red rubber (SBR) suits water, brine, air and low-pressure service; for oil, fuel, solvents or acids ask for Buna, Viton, EPDM or non-asbestos.
Where a 10 in. goes. Municipal water mains, lift station and wastewater discharge, large irrigation headers and the main chilled-water runs in industrial plants. It is the first size in the range to carry twelve bolts rather than eight, and the first on full 1 in. holes — count twelve holes and you are at a 10 in. or 12 in.
Flanging up a whole pump?The suction flange is normally a size or two bigger than the discharge, so a 10in rarely goes in on its own.
- 8in Full Face Flange Gasket — 13-1/2in OD, 8 bolt holes at 7/8in
- 6in Full Face Flange Gasket — 11in OD, 8 bolt holes at 7/8in
Need another size, a different thickness or Buna, Viton, EPDM or neoprene? We cut the full range 1-1/4in to 12in — call or text 561-414-1046 with your flange dimensions.
12in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 19in OD
12in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 19in OD
Item #SH-FF-1200
A 12 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. Pipe size is a name, not a measurement — 12 in. pipe is 12-3/4 in. across the outside, which is why the bore reads 12-3/4 in. and the outer edge 19 in.
Measure across your flange face — if it reads 19 in., this is your gasket.
- Fits pipe size — 12 in. nominal
- Outside diameter — 19 in. (matches the flange face)
- Bolt holes — 12, at 1 in.
- Bolt circle — 17 in.
- Bore — 12-3/4 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb steel and 125 lb cast iron flanges — Class 125 and Class 150 share the same bolt pattern, so one gasket covers both. A Class 300 flange is wider on a different bolt circle and takes a different gasket. Red rubber (SBR) suits water, brine, air and low-pressure service; for oil, fuel, solvents or acids ask for Buna, Viton, EPDM or non-asbestos.
Where a 12 in. goes. Municipal and industrial water mains, treatment plant and lift station discharge, fire service mains into buildings, cooling tower headers and large irrigation trunk lines. It carries the same twelve 1 in. bolts as the 10 in., but on a 17 in. bolt circle instead of 14-1/4 in. — so measure the circle, not just the hole count, if you are deciding between the two.
Flanging up a whole pump?The suction flange is normally a size or two bigger than the discharge, so a 12in rarely goes in on its own.
- 10in Full Face Flange Gasket — 16in OD, 12 bolt holes at 1in
- 8in Full Face Flange Gasket — 13-1/2in OD, 8 bolt holes at 7/8in
12in is the largest we hold as standard stock. Above that, or in a different thickness, oversize bore, Buna, Viton, EPDM or neoprene, we cut to print — call or text 561-414-1046 with your flange dimensions.
2-1/2in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 7in OD
2-1/2in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 7in OD
Item #SH-FF-250
A 2-1/2 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. Pipe size is a name, not a measurement — 2-1/2 in. pipe is 2-7/8 in. across the outside, which is why the bore reads 2-7/8 in. and the outer edge 7 in.
Measure across your flange face — if it reads 7 in., this is your gasket.
- Fits pipe size — 2-1/2 in. nominal
- Outside diameter — 7 in. (matches the flange face)
- Bolt holes — 4, at 3/4 in.
- Bolt circle — 5-1/2 in.
- Bore — 2-7/8 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb steel and 125 lb cast iron flanges — Class 125 and Class 150 share the same bolt pattern, so one gasket covers both. A Class 300 flange is wider on a different bolt circle and takes a different gasket. Red rubber (SBR) suits water, brine, air and low-pressure service; for oil, fuel, solvents or acids ask for Buna, Viton, EPDM or non-asbestos.
Where a 2-1/2 in. goes. Fire sprinkler and standpipe risers, where 2-1/2 in. is a standard line size, plus small pump flanges, booster sets and HVAC branch lines. Like the 5 in., it is a size most pipe runs skip — which is exactly why the gasket can be hard to track down when you do need one. Four bolts on a 5-1/2 in. circle; the 3 in. is the same four bolts on a 6 in. circle, so check the circle rather than the hole count.
Flanging up a whole pump?The suction flange is normally a size or two bigger than the discharge, so a 2-1/2in rarely goes in on its own.
- 3in Full Face Flange Gasket — 7-1/2in OD, 4 bolt holes at 3/4in
- 4in Full Face Flange Gasket — 9in OD, 8 bolt holes at 3/4in
Need another size, a different thickness or Buna, Viton, EPDM or neoprene? We cut the full range 1-1/4in to 12in — call or text 561-414-1046 with your flange dimensions.
2in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 6in OD
2in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 6in OD
Item #SH-FF-200
A 2 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. Pipe size is a name, not a measurement — 2 in. pipe is 2-3/8 in. across the outside, which is why the bore reads 2-3/8 in. and the outer edge 6 in.
Measure across your flange face — if it reads 6 in., this is your gasket.
- Fits pipe size — 2 in. nominal
- Outside diameter — 6 in. (matches the flange face)
- Bolt holes — 4, at 3/4 in.
- Bolt circle — 4-3/4 in.
- Bore — 2-3/8 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb steel and 125 lb cast iron flanges — Class 125 and Class 150 share the same bolt pattern, so one gasket covers both. A Class 300 flange is wider on a different bolt circle and takes a different gasket. Red rubber (SBR) suits water, brine, air and low-pressure service; for oil, fuel, solvents or acids ask for Buna, Viton, EPDM or non-asbestos.
Where a 2 in. goes. The most common of the small flange sizes — booster pumps and small circulators, pool and spa equipment pads, irrigation laterals and valve manifolds, and HVAC branch lines. Four bolts on a 4-3/4 in. circle. The 2-1/2 in. and 3 in. carry the same four 3/4 in. bolts, so the outside diameter is what separates them: 6 in., 7 in., 7-1/2 in.
Flanging up a whole pump?The suction flange is normally a size or two bigger than the discharge, so a 2in rarely goes in on its own.
- 2-1/2in Full Face Flange Gasket — 7in OD, 4 bolt holes at 3/4in
- 3in Full Face Flange Gasket — 7-1/2in OD, 4 bolt holes at 3/4in
Need another size, a different thickness or Buna, Viton, EPDM or neoprene? We cut the full range 1-1/4in to 12in — call or text 561-414-1046 with your flange dimensions.
3in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 7-1/2in OD
3in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 7-1/2in OD
Item #SH-FF-300
A 3 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. Pipe size is a name, not a measurement — 3 in. pipe is 3-1/2 in. across the outside, which is why the bore reads 3-1/2 in. and the outer edge 7-1/2 in.
Measure across your flange face — if it reads 7-1/2 in., this is your gasket.
- Fits pipe size — 3 in. nominal
- Outside diameter — 7-1/2 in. (matches the flange face)
- Bolt holes — 4, at 3/4 in.
- Bolt circle — 6 in.
- Bore — 3-1/2 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb steel and 125 lb cast iron flanges — Class 125 and Class 150 share the same bolt pattern, so one gasket covers both. A Class 300 flange is wider on a different bolt circle and takes a different gasket. Red rubber (SBR) suits water, brine, air and low-pressure service; for oil, fuel, solvents or acids ask for Buna, Viton, EPDM or non-asbestos.
Where a 3 in. goes. Small pump suction and discharge, booster sets, pool and spa equipment pads, irrigation laterals, and the strainer and valve flanges on branch lines. It is the largest size in the range with only four bolts — the 4 in. steps up to eight, so if your flange has eight holes you are already past a 3 in.
Flanging up a whole pump?The suction flange is normally a size or two bigger than the discharge, so a pump with a 3in discharge usually takes a 4in on the suction side.
- 4in Full Face Flange Gasket — 9in OD, 8 bolt holes at 3/4in
- 6in Full Face Flange Gasket — 11in OD, 8 bolt holes at 7/8in
Need another size, a different thickness or Buna, Viton, EPDM or neoprene? We cut the full range 1-1/4in to 12in — call or text 561-414-1046 with your flange dimensions.
4in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 9in OD
4in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 9in OD
Item #SH-FF-400
A 4 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. The bolt holes are cut through, so it drops over the bolts and locates itself. Pipe size is a name, not a measurement — 4 in. pipe is 4-1/2 in. across the outside, which is why the bore reads 4-1/2 in. and the outer edge 9 in.
Measure across your flange face — if it reads 9 in., this is your gasket.
- Fits pipe size — 4 in. nominal
- Outside diameter — 9 in. (matches the flange face)
- Bolt holes — 8, at 3/4 in.
- Bolt circle — 7-1/2 in.
- Bore — 4-1/2 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb and 125 lb flanges. 150 lb is the flange class, not a weight — it fixes the bolt pattern. Class 125 cast iron, the kind on Goulds, Berkeley, Cornell and Gorman-Rupp pump casings, uses the identical pattern, so one gasket covers both. A Class 300 flange is an inch wider on a different bolt circle and takes a different gasket.
Where a 4 in. goes. Pump suction and discharge flanges, irrigation mains and sprinkler risers, booster skids, and the strainer and valve flanges either side of them. It is the first size in the range with eight bolts instead of four — count four holes on your flange and you have a 3 in. or smaller.
Red rubber (SBR) suits water, brine, air and low-pressure service. It is not a chemical gasket — for oil, fuel, solvents or acids you want Buna, Viton, EPDM or non-asbestos, and we cut all four.
Flanging up a whole pump?A pump almost never takes just one gasket — the suction flange is normally a size or two bigger than the discharge. We cut the full 150 lb run in red rubber, 1-1/4 in. through 12 in.
- 2 in. Full Face Flange Gasket — 6 in. OD, 4 bolt holes
- 6 in. Full Face Flange Gasket — 11 in. OD, 8 bolt holes
- All sizes, with the size chart — measure the flange OD and read off your size
Need a different thickness, an oversize bore, or Buna, Viton, EPDM or neoprene? We cut to print — call or text 561-414-1046 with your flange dimensions.
Seal House USA provides aftermarket replacement parts. Any OEM names are used strictly for cross-reference. We are an independent supplier.
5in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 10in OD
5in Full Face Flange GasketRed Rubber 150#/125#, 1/8in Thick, 10in OD
Item #SH-FF-500
A 5 inch full face gasket in 1/8 in. red rubber, cut to ASME B16.21 for 150 lb flanges. The bolt holes are cut through, so it drops over the bolts and locates itself. Pipe size is a name, not a measurement — 5 in. pipe is 5-9/16 in. across the outside, which is why the bore reads 5-9/16 in. and the outer edge 10 in.
Measure across your flange face — if it reads 10 in., this is your gasket.
- Fits pipe size — 5 in. nominal
- Outside diameter — 10 in. (matches the flange face)
- Bolt holes — 8, at 7/8 in.
- Bolt circle — 8-1/2 in.
- Bore — 5-9/16 in.
- Thickness — 1/8 in.
- Material — red rubber (SBR), 70 Shore A, -20°F to 180°F
- Flange class — 150 lb steel or 125 lb cast iron
Fits 150 lb and 125 lb flanges. 150 lb is the flange class, not a weight — it fixes the bolt pattern. Class 125 cast iron, the kind on Goulds, Berkeley, Cornell and Gorman-Rupp pump casings, uses the identical pattern, so one gasket covers both. A Class 300 flange is wider on a different bolt circle and takes a different gasket.
Where a 5 in. goes. Five inch is the odd size out — most pipe runs jump straight from 4 in. to 6 in., so plenty of suppliers skip it and the gaskets are awkward to track down. It turns up on older cast iron pump casings, fire and irrigation mains, and process lines laid before 6 in. became the default. It is also where the bolt holes step up from 3/4 in. to 7/8 in.
Red rubber (SBR) suits water, brine, air and low-pressure service. It is not a chemical gasket — for oil, fuel, solvents or acids you want Buna, Viton, EPDM or non-asbestos, and we cut all four.
Flanging up a whole pump?A pump almost never takes just one gasket — the suction flange is normally a size or two bigger than the discharge. We cut the full 150 lb run in red rubber, 1-1/4 in. through 12 in.
- 4 in. Full Face Flange Gasket — 9 in. OD, 8 bolt holes at 3/4 in.
Need another size, a different thickness, an oversize bore, or Buna, Viton, EPDM or neoprene? We cut the full range 1-1/4 in. to 12 in. — call or text 561-414-1046 with your flange dimensions.