SeaTech Reducing Shut Off Valve 1/2" CTS x 1/4" Tubing with Push-Quick Connect Fitting Part # 3539-1004

Watts® Water Technologies, Inc. is a long-established manufacturer of plumbing and flow-control solutions used in residential, commercial, and industrial water applications. Watts supports both DIY and professional water treatment installations with dependable shutoff valves, pressure reducing valves, and quick-connect fittings that help simplify new installations, retrofits, and service work.

The Watts lineup includes AquaLock™ / SeaTech quick-connect fittings and lead-free pressure reducing valves. These components are commonly used alongside reverse osmosis systems, filtration equipment, and other water treatment systems where secure connections, controlled pressure, and reliable long-term performance are essential.

About Watts Plumbing & Installation Valves / Fittings

Founded in 1874 by Joseph Watts, the company has a long history of safety innovation in the manufacture of relief and pressure-reducing valves used to help regulate steam and protect water heaters and boilers. Over time, the Watts product line expanded significantly to meet the demands of modern plumbing and water equipment installations.

Today, that lineup includes push-to-connect valves and fittings, CTS plumbing connections, and pressure reducing valves used to support water filtration and purification system installations. These are the kinds of components installers rely on when tying treatment equipment into existing plumbing lines, adding feed-water connections, or managing incoming pressure to help protect downstream systems.

Watts AquaLock™ fittings are designed for fast, secure connections without tools and are suitable for use with CTS-sized pipe such as PEX, copper, and CPVC. For those familiar with the older SeaTech name, that continuity is also important, since SeaTech products now sit within the AquaLock family and remain widely recognized in marine, RV, and general plumbing applications.

For pressure management, Watts® lead-free pressure reducing valves are designed to reduce incoming water pressure to a safer, predetermined downstream level. In water treatment applications, this can be especially useful for helping protect filtration housings, valves, tubing, and connected plumbing components from excessive line pressure while supporting more stable system performance.

If you are looking for a specific Watts valve, AquaLock fitting, SeaTech crossover part, or installation component not listed on this page, please contact us by email or call our office (1-866-489-4004) for assistance. Our team can help identify the correct plumbing or flow-control component for your water treatment installation.

Browse our full selection of Watts installation valves, AquaLock / SeaTech quick-connect fittings, and related plumbing components and get dependable water system parts shipped FAST from our Canadian warehouse DIRECTLY to your door. A real Water Guy can help you select the right fittings and valves for your project.