If you have a GFB blow-off valve with two outlets and want to plug one of them, this is the plug to use. It replaces either a trumpet or recirc outlet to effectively disable the venting port. On Hybrid valves for example, it is used to change from 50/50 to full atmosphere or full recirc venting, by plugging the appropriate outlet.

Product Reviews for GFB6309 - GFB