Pump Union adapter 50100120: 1 1/2 inch FBT (female buttress thread) x 2 inch MBT (male buttress thread) Threaded Adapter for Aqua Flo spa pumps.

Needs O-Ring 92200140. sold separately

Or get the complete set - pump union adapter and o-ring here: 50100130.

We also offer the pump unions for 2 inch plumbing that have 2 inch female buttress threads - 52272000

We offer the pump unions for 1 1/2 inch plumbing that have 1 1/2 inch female buttress threads 52271000