Installing a Pegsus tub and shower unit. I have a part that I can"t seem to locate in the diagram. 3/4" male on one end with two O-rings on the other 5/16" apart 1/2" from the end, with two flat 1/2" grooves at the end. Lenght of pipe is2 1 1/2". Model# 566-712 Seris 1000 I think