Hayward Union [1-1/2" MPT x 1-1/2" Slip] [Flush] (SP14953S) aquaflo Union-style valves are useful because

Union-style valves are useful because they can simplify service access compared with more permanent plumbing connections

CMP generic Hayward Jet Air III test plug tool

74 amps with an approximate 12 to 18 GPM performance range using the 59896291 reference

and this Jacuzzi AV

Hayward Union [1-1/2" MPT x 1-1/2" Slip] [Flush] (SP14953S) aquaflo Union-style valves are useful becauseThe Hayward flush union is designed for compatible plumbing applications where a serviceable 1 1 2 inch MPT to 1 1 2 inch slip connection is needed. A union like this is useful because it helps bridge threaded and slip style plumbing while preserving the ability to disconnect the joint later for maintenance. This replacement is especially useful when the original union is cracked, leaking, worn, or no longer sealing correctly. Replacing it can help