What kind of union is this?

andysousa

Well-known member
May 14, 2018
47
Salem MA
I was closing the pool today and decided to make nice fittings for my cyclone. On the returns I was simply going to take the coupling off and attach my cyclone. Got myself all the adapters and union from Home Depot (2” pvc) but low and behold that union from Home Depot just didn’t work. 1 1/2 is to small... what am I missing.

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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
15,805
Tucson, AZ
Heater unions are typically a proprietary thread pitch (they’ll use metric or some kind of uncommon English unit thread pitch). It’s designed to make it easy to unthread when the pool equipment pad is tight and to keep you from finding easy/cheap replacements 😉
 

Pool_Medic

In The Industry
Apr 1, 2018
1,060
Bangor Maine
That’s a standard pool supply 1.5” union. Home Depot parts won’t connect. Rather than different parts for your cyclone, try this.

5’ section of vac hose, on one end you slide it over a mpt/ barbed 1.5” fitting. On the other end you put a weir adapter that will push and lock temporarily into 1” to 2.5” openings.
 

andysousa

Well-known member
May 14, 2018
47
Salem MA
Ah, thank you all. Should have known it wasn’t standard plumbing stock. Good to know moving forward as one of the unions is cracked and I want to replace it in the spring. Thanks