# Caleffi Dual Check Backflow Preventer Atmospheric Vent 1/2" Internal NPT Union 573403A

**Brand:** [Caleffi](https://shop.coreranger.com/brands/Caleffi)
**SKU:** 573403A
**Price:** $127.77 · in stock
**URL:** https://shop.coreranger.com/product/caleffi-dual-check-backflow-preventer-atmospheric-vent-1-2-internal-npt-union-573403a-700052053

## Specifications

| Spec | Value |
|---|---|
| Model # | 573403A |
| Pack Size | 1 |
| Internet # | 700052053 |
| Returnable | 90-Day |
| Store SKU # | 1015890442 |
| HVAC Product Type | Backflow Preventer |
| Manufacturer Warranty | 90 day parts warranty. |

## Description

The Caleffi 573403A Backflow Preventer features a 1/2" NPT union connection with dual check valves and an atmospheric vent, designed to prevent reverse flow and protect water quality in HVAC systems.