Metlok Private Limited manufactures Anaerobic Flange Sealant. Metlok Private Limited is an ISO 9001: 2000 certified company. Anaerobic Flange Sealant or My-T-Lok® 257 [Super Gasket] is a single component, medium strength sealant which cures when confined in the absence of air between close fitting metal surfaces. Its applications include sealing close fitting joints between rigid metal faces and flanges. It is also used as a form-in-place gasket on rigid flanged connections, e.G. Gearbox and engine casings, etc.