Dow Corning 111 O-Ring Valve Silicone Lubricant & Sealant FDA NSF Scuba 2oz 57g Genuine Dow Corning 111. Excellent Water Resistance. Sealant for vacuum and pressure systems. Rubber and plastic O-rings, gaskets and seals. Lubrication for control and pressure plug valves, water softener and faucet valves. Sealant for outdoor equipment (also shipboard) subject to washing and harsh environmental exposure: meters, electrical service entrance and underground connections. Used as an anti-stick and sealant for transformer gasket and equipment enclosures. It prevents gaskets from sticking to metal and resists weathering and water washout.