High quality machined Aluminium protective insert, to provide a high level of protection against contamination and possible damage from dents, scrapes etc. to SCUBA Diving or Air Gun type high pressure cylinder valves with a standard Female EN-144-1 type G5/8” DIN fitting. Quickly and simply attached to adjacent hoses etc. by looping the attached integral cord around the hose, the cord is easily and quickly removed if not required. May also be used to protect similar Female threads on Air Filters, Air Gun Fittings etc.