Matco-Norca 646AS4 Brass Hose-End Backflow Preventer

The Matco-Norca 646AS4 brass hose-end backflow preventer stops contaminated water from flowing back into your potable supply. Its compact, serviceable design fits standard garden hose connections and is built for reliable outdoor use.

• Material: Brass body with corrosion-resistant finish for long service life.
• Thread Size: Fits 3/4-inch garden hose threads (GHT), female-to-male hose connection.
• Approvals: Conforms to ASSE 1011 and is UPC/IAPMO listed for potable applications.
• Security: Break-away set screw secures the unit to the hose bibb and deters tampering.
• Performance: Rated to 125 PSI and compatible with nitrile softgoods up to 180°F.
• Installation: Compact, tool-assisted installation for typical outdoor faucets and hose setups.

Designed for residential landscaping, irrigation, and general outdoor water use, the 646AS4 provides dependable backflow protection when installed on hose bibbs and portable equipment. Follow local plumbing codes for backflow prevention and replace units that show wear or damage.