4in Full Face Flange Gasket — Red Rubber 150#/125#, 1/8in Thick, 9in OD

Name: 4in Full Face Flange Gasket — Red Rubber 150#/125#, 1/8in Thick, 9in OD
SKU: SH-FF-400
Price: 5.25 USD
Availability: InStock

SKU: SH-FF-400

Weight	.25 lbs
Dimensions	10 × 10 × .5 in

Title	Quantity	Price Per Unit
Pre Cut Gasket 15 20 25 Rule	1 - 2	0% $5.25
Pre Cut Gasket 15 20 25 Rule	3 - 5	15% $4.46
Pre Cut Gasket 15 20 25 Rule	6 - 9	20% $4.20
Pre Cut Gasket 15 20 25 Rule	10 +	25% $3.94

QTY	Price
4in Full Face Flange Gasket — Red Rubber 150#/125#, 1/8in Thick, 9in OD quantity	$5.25

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DESCRIPTION
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.

Disclaimer: Seal House USA provides aftermarket replacement parts. Any OEM names are used strictly for cross-reference. We are an independent supplier.