GFB BOV To AN-4 MALE FLARE VACUUM ADAPTOR.

Converts the standard brass hose barb on popular GFB BOVs to AN-4.

If you run big boost and need to connect a braided vacuum hose to your GFB BLOW OFF VALVE, this is the product you need! Constructed from stainless steel and supplied with a Viton o-ring to seal to your GFB BLOW OFF VALVE.

Suits all GFB Mach 2, Hybrid, Respons, and Deceptor Pro II blow off valves where the existing brass hose barb features a female hex in the hole (early versions of these products had a round hole and a different thread that is not compatible with this product).