Various components of common scuba equipment such as DIN-fittings and regulator second stage inlets require thread sealants, but Locktites ARE NOT O2 compatible. Instead, LOX-8 paste can be substituted to mildly freeze such threaded components. This greenish colored fluorocarbon is fully O2 compatible. 25 gram jar. Order 42145OX for 100 gram jar; 42146OX for 100 gram plunger.