Heater Union Nut, 2-1/2"MSRP: $24.95Was: $24.95Now: $20.64
10649, Pump UnionMSRP: $12.57Was: $12.57Now: $11.31
10762, Heater Union Nut, 2''MSRP: $14.95Was: $14.95Now: $12.95
Unions (screw on to plumbing connections)
These are the parts you use to tighten two plumbing parts together. Plumbing to a pump or heater for example.