GFB's foam filter is designed for atmosphere‑venting blow‑off valves operating in dirty environments and fits any 38mm BOV outlet. The 5711 element uses a foam filter with internal steel reinforcement and installs onto 38mm openings, including compatibility with GFB's 5703 trumpet and 5238 recirc outlet for added protection where open venting is required.

GFB Foam Filter for Atmosphere-Venting BOVs