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+1 (217) 579-8045Bell & Gossett pair of 1" NPT ball valves mounted on a pump flange with capscrews and nuts. This isolation flange can be used on the following B&G circulators: NRF, NBF, and SSF wet rotors, Series PL-30, PL-36, and PL-55, Series 100, PR, and LR pumps. Isolation flanges combine a circulator flange and ball valve to allow the circulator to be isolated from the system for quick and easy removal. It also allows pump throttling.