The VR-801 vacuum relief valve is designed to protect hot water supply systems and pressure vessels against negative pressure. It is especially well suited for many domestic and commercial systems. It works by preventing internal vacuum conditions that could result in burned out heaters and/or collapsed storage tanks. Installed on the cold water supply line, the Cash Acme VR-801 closes tightly under pressure and opens at a 1 in mercury vacuum. Atmosphere admitted to the system breaks the vacuum, preventing collapse of the storage tank.

• Drilled vent with dust cover
• Prevents internal vacuum conditions-guards against siphonage, burnt-out heaters and collapsing of storage tanks and negative pressure
• Opens quickly in emergency situations on a one in mercury vacuum
• Every valve is tested for performance prior to shipping
• Water service
• 1 in Hg vacuum relief pressure open
• Brass body cap and internal parts
• Stainless steel spring
• Polypropylene dust cover

Weight	0.37 lb
Connection Size	3/4 in.
Height	6.00 in.
Length	6.00 in.
Material	Brass
Type	Check Valves
Width	6.00 in.
Inventory Number	CASVR20
MPN	22398LF

• Specification Sheet
• Installation Instructions
• Warranty