O-ring Gasket for 3" pump and heater union tailpiece. Featuring a gasket and O-ring molded into a single piece. Design is superior to plain O-ring, for drip-free seal.

• 3" O-ring Gasket
• Measures 4-1/8" O.D.

Product notes: Chemically-resistant polymer. Used with Big Red and Acura 3" pump unions. Part Numbers: 711-2640.