I have an older Laars heater. The in and outflows are plumbed with 1 1/2" L-shaped stainless (?) pipes about 18" in length. The pipes have a 2 1/4" flange on the end and are connected via some sort of coupler/union to 1 1/2" flex PVC.

The couplers have deteriorated and are leaking badly. The Laars parts diagram doesn't show the s-steel pipes or unions.

Does anyone know where I can get these couplers, or exactly what they're called?