Thread sealing thread - instant sealing layer resistant to working pressure. The sealing joint can be reliably adjusted. LOCTITE 55 is designed to fix and seal metal and plastic pipes and joints. Creates an instant sealing layer resistant to working pressure without waiting for it to harden. Perfect when you need to seal quickly, easily and reliably. The product is certified for use in contact with gas and potable water, and is also certified to the NSF / ANSI 61 standard.