1" ½ Union for Above

The Waterway hot tub pump union 400-1990 has threads referenced as 1” with an actual inside diameter of 1-7/8” and a 1" spigot end. The spigot end of this pump union is designed to fit inside a fitting referenced as having a 1-inch slip end that has an actual inside diameter of 1-3/8”. It's important to note that in the pool and hot tub industry, plumbing dimensions are referred to as nominal sizes rather than actual sizes. Details: Waterway P/N: 400-1990 Brand: Waterway Plastics Threads: 1", (Actual ID 1-7/8") Connection: 1" Slip Colour: White Material: PVC Includes O-ring Will not fit any plumbing connections in inflatable spas, Intex pools, Bestway pools or any Chinese made pool or spa with metric plumbing sizing. Good To Know This threaded pump union is primarily used on the small red Waterway Tiny Might hot tub circulation pumps.