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FPPI® check snoots are made of brass and typically used on multiple inlet fire department connections to help prevent backflow of water into connected supply lines. A breakable cap or male NST plug should be used to protect threads and prevent debris from entering the waterway.
FPPI® 4380004640 Check Snoot, Snoot Fitting, 2-1/2 in FNST x 3 in MNPT Fitting Connection, Brass