What kind of union is this?

[andysousa]

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.

 

[JoyfulNoise]

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]

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]

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