Seal Guide for 2" Cap

With the simple 2" plugs it often happens that the O-ring is moved away from the plug when it is tightened and the plug is no longer tight. The Seal Guide is placed on the plug and holds the O-ring in position. This ensures that the O-ring is not pressed outwards even under pressure, e.g. when do a pressure test on the installation. I use the Guide with caps from the german shop Pool Total:Winterstopfen 2"