Watts Brass Tubular 3539-10 Straight Stop 1/2 in 5-pack

Product Description

The WATTS BRASS TUBULAR 3539-10 is a quick connect straight stop valve designed for shutoff service on PEX, copper, and CPVC supply lines. The tool-free push-to-connect design allows the fitting to be installed by simply cutting the pipe square and pushing the tubing into the fitting end until it seats at the internal stop. Rated to 250 PSI, the single-piece construction eliminates loose components during installation. This valve is sold in a 5-pack, making it practical for new construction rough-in work or multiple-fixture repair calls. Licensed plumbers and experienced pipe fitters are the primary installers for this type of stop valve.

The 3539-10 is suited for residential and light commercial plumbing installations where a compact inline shutoff is needed on 1/2-inch supply lines. Its code-approved status covers behind-wall installations without access panels and direct in-ground burial applications, extending its use to concealed or underground service scenarios. It serves as a direct replacement for Qest and Flare It type fittings in retrofit and repair work, and is appropriate for new installations involving PEX, copper, or CPVC tubing.

Key Features

• Tool-free push-to-connect installation requires no special installation tools
• Rated to 250 PSI working pressure
• Single-piece design with no loose parts to assemble or misplace
• Approved for behind-wall without access and direct in-ground burial installations
• NSF-14 and NSF-61 certified; CSA/ASTM and UPC listed and approved
• Compatible with PEX, copper, and CPVC tubing on both ends
• Disconnect by pulling back on the release ring to free the tubing

Compatibility

Designed for use with PEX, copper, and CPVC tubing on 1/2-inch supply lines. Functions as a replacement for Qest and Flare It type fittings in repair and retrofit applications.

Installation Notes

Installation is performed by a licensed plumber following applicable IPC or local plumbing code requirements. Shut off the main water supply and relieve line pressure before cutting into any existing supply line. Cut tubing square and deburr the end before inserting it into the fitting to ensure a proper seat and leak-free connection. To disconnect, pull back firmly on the release collar ring while withdrawing the tubing.