554™ Thread Sealant, Refrigerant Sealant, 10 mL Bottle, Red no checkout compact design fits well under compact design fits well under welding helmets and with safety glasses Mask drops down for convenient storage around the neck or locks down for custom fit Adjustable head cradle and curved neck buckles for extra comfort Use a brass cylinder adaptor to connect a regulator to a cylinder or other equipment when different CGA threads on the mating parts make a direct connection impossible Adaptors should not be used as permanent installations Excellent solvent resistance on threaded fittings and pipes up to 3" in diameter Recommended for refrigeration systems and service with aggressive chemicals