Set of o-rings and silicone grease used to rebuild a set of five Monster Valves (MV1,MV2, MV3, MV4, MV-Tap, MV-Wedge, and MV-Flat). Longevity is always top of mind when we are designing products at Power Tank. Rebuilding a part is always a better option than replacing it and will ensure it functions for years. Monster Valve can be rebuild simply by replacing and lubing the o-rings. This rebuild kit includes five replacement o-rings for the red collar, five replacement o-rings for the stem, and a small packet of silicone grease to keep things running smooth.