Exhaust Check Valve Fitting Fiberglass 4 x 21 x 9.06

A=4.0"
B=3.5"
C=21.0"
D=9.06"

Where space is available, the Fiberglass Check Valve helps quiet exhaust noise and inhibits water intrusion. The # 316 stainless steel and Teflon® hinge mechanism will give you years of trouble-free service in either fresh or salt water. The enlarged body area allows exhaust gases to expand and cool, helping to reduce noise.