2" Gasket With Embedded O-Ring 711-4030 Typically used with unions that connect to 2 inch inner diameter flow through heaters. Part Type GasketUnion Fitting Application PumpInside Diameter...
1.5" Flat Gasket 711-4000 for 1 1/2 inch plumbing connections. Inside Diameter 1-7/16"idOutside Diameter 2-5/16"odUnion Fitting Part Type GasketManufacturer Generic