6in Full Face Flange Gasket — Red Rubber 150#/125#, 1/8in Thick, 11in OD

A 6 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 — 6 in. pipe is 6-5/8 in. across the outside, which is why the bore reads 6-5/8 in. and the outer edge 11 in.

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 6 in. goes. Irrigation and fire mainlines, municipal and HVAC chilled-water lines, and the suction side of larger pumps — a pump with a 4 in. discharge usually takes a 6 in. suction, so the two sizes often go in together. Same 7/8 in. bolts as the 5 in., on a bolt circle an inch larger.