Wilkins 34-375XLB Reduced Pressure Backflow Preventer 3/4

Product Description

The WILKINS 34-375XLB is a 375XL series composite vessel reduced pressure backflow preventer designed to protect potable water supplies from contamination caused by backpressure or backsiphonage. Built with a reinforced nylon body, this unit is suited for plumbing and irrigation systems where a compact, corrosion-resistant assembly is required. The 3/4 inch FNPT connections and quarter-turn ball valve design allow for straightforward installation and isolation without specialized tooling. Licensed plumbers and pipefitters install this type of device on commercial and residential service lines in compliance with local cross-connection control requirements.

The 34-375XLB is applied on 3/4 inch service lines in residential, light commercial, and irrigation applications where a reduced pressure zone assembly is required by code. Typical installations include domestic water service entry points, lawn irrigation systems, and equipment protection on boiler makeup water lines. The FNPT end connections are compatible with standard threaded pipe fittings in these configurations.

Key Features

• Reduced pressure zone design provides the highest level of backflow protection for potable water systems
• Reinforced nylon composite body resists corrosion in damp or wet installation environments
• 3/4 inch FNPT end connections for standard threaded pipe assembly
• Quarter-turn ball valve shutoffs allow fast isolation during service or testing
• Composite vessel construction reduces overall assembly weight compared to brass alternatives

Compatibility

Designed as an OEM-style reduced pressure backflow preventer for 3/4 inch threaded plumbing and irrigation service lines requiring cross-connection control protection.

Installation Notes

Installation must be performed by a licensed plumber or certified backflow prevention assembler in accordance with local plumbing codes and authority having jurisdiction requirements. Shut off the water supply and relieve line pressure before beginning installation. The assembly should be mounted in a horizontal orientation unless the manufacturer documentation specifies otherwise, and adequate clearance must be provided for annual testing and relief valve discharge. After installation, the device must be tested and documented by a certified tester per local cross-connection control program requirements.

Technical Specifications

• Nominal Size: 3/4 inches
• End Connection Style: FNPT
• Body Material: Reinforced Nylon (Composite)
• Valve Type: Quarter-Turn Ball Valve
• Assembly Type: Reduced Pressure Zone Backflow Preventer
• Series: 375XL

Standard Information

• Brand: WILKINS
• Manufacturer Part Number: 34-375XLB