Barnes & Jones 3520 Cage Unit Cover for CU 1/2"WW #12H4 BB&B

Barnes & Jones 3520: cover assembly for CU 1/2"WW #12H4 BB&B, matched to cage unit 3520.

A Barnes & Jones cage unit contains every working part of a thermostatic steam trap, including the seat, calibrated together under steam at the factory and locked into a stainless steel housing. It drops into the existing trap body as a one-piece, removable, testable unit, with no loose parts to align or over-tighten. Type A units serve vacuum to 25 psig, Type B to 65 psig and Types C and D to 300 psig.