# Cash Acme 1/2 in. Vacuum Relief Valve with Dust Cover

**Brand:** [Cash Acme](https://shop.coreranger.com/brands/Cash%20Acme)
**SKU:** 22397LF
**Price:** $14.76 · in stock
**URL:** https://shop.coreranger.com/product/cash-acme-1-2-in-vacuum-relief-valve-with-dust-cover-306867118

## Specifications

| Spec | Value |
|---|---|
| Model # | 22397LF |
| Material | Brass |
| Pack Size | 1 |
| Internet # | 306867118 |
| Returnable | 90-Day |
| Store SKU # | 1009822100 |
| Product Type | Relief Valve |
| Finish Family | Bronze/Copper Metallic |
| Product Depth (in.) | 2.45 in |
| Product Width (in.) | 1.75 in |
| Product Height (in.) | 1.38 in |
| Manufacturer Warranty | Must be installed per installation instructions. |

## Description

The VR20 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 VR20 closes tightly under pressure and opens at a 1. mercury vacuum. Atmosphere admitted to the system breaks the vacuum, preventing collapse of the storage tank.

• Prevents internal vacuum conditions
• Opens quickly in emergency situations
• Dust cover protects vent hole