B&G part number 101223 is a pair of 1-1/4"NPT ball valves mounted on a pump flange with capscrews & nuts.
This "Isolation Flange" (Valves) can be used on the following B&G circulators. NRF/NBF/SSF wet rotors, Series PL-30, PL-36, PL55 & Series 100, PR & LR pumps. Isolation Flanges combine a circulator flange an ball valve to allow the circulator to be isolated from the system for quick and easy removal. Also allows pump thottling.