Camco RV Polar White Replace All Plumbing Vent Cap Only fits up to a 2" pipe. Features spring tension attachment, which eliminates the need to replace the entire vent just because of a lost cap top. Patented. Replaces lost or damaged RV Plumbing Vent Caps Cap fits up to a 2" pumbing vent pipe Made with UV inhibitors to extend the life of your vent cap Features spring tension...