Vacuum valve fitting for housings with a spare 1/2" accessory port. The valves low profile avoids interference with control operation. The included waterproof plug is secured to the fitting to prevent accidental loss. Includes vacuum pump with gauge. This valve is installed quickly and easily by securing one nut on the inside of the housing. The housing does not need to be returned to the factory for installation. Housing Compatibility Most newer housings with an opaque white front feature a spare 1/2-20 threaded accessory port. The plug of this spare port may be replaced with this vacuum valve.