This is a flat rubber gasket that fits a standard 1.5 union.

Aquatemp Products Heater Uni-Nut�

It is a patented design to end leaking split nuts on heaters. The Uni-Nut� is a one-piece nut that can be tightened by hand and changed in the field by removing a color-coded retainer. The black retainer is generally used on 1-5/8" tube while blue retainers are used on 5.5kW heaters. Red retainers usually denote heaters of other wattages. Although there may ...

This replacement split nut has a larger inside diameter on the collar than those usually used on spa heaters but has the same thread size. It is designed to go over the larger diameter plastic inserts found on pump unions.

This union has the "standard" 2 inch union thread found on many brands of industry equipment - Waterway, Aqua-flo, Sta-Rite, Acura, Vico and many others use this thread on ...