Watts 887540 First Check Module 009M2 LF009M2 4000B

Product Description

The WATTS 887540 is a first check module designed as a replacement or service component for WATTS backflow preventer assemblies in the 2-inch size class. This module fits within the check valve assembly of a reduced-pressure zone or double-check backflow preventer, functioning as the upstream check element that prevents reverse flow of potentially contaminated water into the potable supply. It is a precision-fit component that restores the first check seat function when the original module shows wear, fouling, or failure. Licensed plumbers and cross-connection control specialists install this part during scheduled testing and repair of backflow prevention devices on commercial and residential water service lines.

This module is sized for 2-inch backflow preventer bodies and is used in repair and maintenance of WATTS 009M2, LF009M2, and 4000B series assemblies. These assemblies are commonly installed on irrigation systems, fire suppression service lines, boiler makeup water connections, and commercial plumbing systems where code requires backflow protection. The 887540 module allows field technicians to restore full backflow prevention function without replacing the entire valve body, reducing material cost and downtime on tested assemblies.

Key Features

• Replacement first check module restores upstream check function in 2-inch backflow preventer bodies
• Compatible with WATTS 009M2, LF009M2, and 4000B series assemblies per manufacturer data
• Designed as a direct-fit service part to minimize labor time during repair
• Compact and lightweight at 0.58 pounds for easy field handling

Compatibility

Designed for use with WATTS 009M2, LF009M2, and 4000B backflow preventer assemblies in the 2-inch size.

Installation Notes

Installation should be performed by a licensed plumber or certified cross-connection control tester in accordance with local plumbing codes and ASSE standards. Shut off the water supply and relieve line pressure before disassembling the backflow preventer body. Inspect the check seat and seals during module replacement and replace any worn components before returning the assembly to service. After installation, perform a field test of the backflow preventer to verify proper differential pressure and check valve function.

Technical Specifications

• Size: 2 inches
• Weight: 0.58 pounds
• Compatible Assemblies: 009M2, LF009M2, 4000B

Standard Information

• Brand: WATTS
• Manufacturer Part Number: 887540