B&G part number CTF-1"NPT is (1) Isolation Flange valve and (1) Check-Trol valve. Mounted on pump flanges with capscrews & nuts.
This "Check-Trol" (Valve) and Isolation Flange" (Valve) package 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. This package combines a isolation ball valve to allow the circulator to be isolated from the system for quick and easy removal, with a internal spring check to prevent gravity ciculation. Also allows pump flow control.