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Manufacturer Resources
Product Specs
- Brand Name:
- Watts
- Brass Insert:
- No
- Fitting Name:
- Supply Stop
- Inlet Connection Size:
- 1/2 IN
- Inlet Connection Size Metric:
- 15 MM
- Inlet Connection Type:
- Quick Connect
- Inlet Material:
- Polysulfone
- Lead Free:
- Yes
- Maximum Working Pressure Bar:
- 17.2
- Maximum Working Pressure Psi:
- 250
- Maximum Working Temperature Celsius:
- 82
- Maximum Working Temperature Fahrenheit:
- 180
- Minimum Temperature Celsius:
- 24
- Minimum Temperature Fahrenheit:
- 75
- Model Number:
- 3539B-10
- O Ring Material:
- EPDM
- Outlet Connection Size:
- 1/2 IN
- Outlet Connection Type:
- Quick Connect
- Outlet Material:
- Polysulfone
- Part Number:
- 650246
- Series:
- 3539B
- Suitable For Gas Service:
- No
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Stop Valve
- Product Finish:
- Polysulfone
- Product Material:
- Polysulfone
Watts 3539B-10 – Frequently Asked Questions
1) What pipe does the Watts 3539B-10 quick connect stop valve connect to?
Both ends of the 3539B-10 are 1/2 inch CTS quick connect, inlet and outlet. CTS is copper tube size, so it pushes onto 1/2 inch CTS tubing on the supply side and 1/2 inch CTS on the outlet side. There are no threads to cut and no solder joint. If your stub-out is threaded or you need an angle stop with a compression or IPS inlet, this straight push-connect version is the wrong part.
2) Is the Watts 3539B-10 stop valve lead free for potable water?
Yes, the 3539B-10 is listed lead free. The body is polysulfone plastic rather than brass, with EPDM O-rings, and there is no brass insert in this model, so there is no leaded brass in the waterway at all. That matters for potable water work in jurisdictions enforcing lead-free supply components.
3) Can I use the Watts 3539B-10 on a gas line?
No. The 3539B-10 is a water supply stop and is not suitable for gas service. Use a listed gas valve for any fuel gas application.
4) What pressure and temperature can a Watts 3539B supply stop handle?
The 3539B is rated to 250 psi (17.2 bar) and 180 F (82 C) maximum. That covers normal domestic cold and hot water service, including hot supplies to lavatories and sinks. It is not a steam or high-temperature fitting, and the rated minimum working temperature is 75 F (24 C), so it is not intended for freezing or unheated locations.
5) Is a plastic push-connect stop valve durable enough for apartment turnovers?
The 3539B-10 is a polysulfone-bodied supply stop, not a chrome brass quarter-turn. Polysulfone is a rigid engineering plastic rated here to 250 psi and 180 F, and it will not dezincify or corrode on aggressive water the way brass can, which is why these get used behind lavatories and toilets in multi-family work. The trade-off is appearance: the finish is the raw polysulfone body, so for an exposed stop under a finished fixture where the occupant sees it, a chrome-plated stop is usually specified instead.
6) Do I need tools or solder to install the Watts 3539B-10 stop valve?
No soldering, no threading, no crimp ring. Both the 1/2 inch inlet and 1/2 inch outlet are quick connect, so the tubing pushes in and the internal O-ring seals it. The seals are EPDM. Nothing else ships with the valve, so supply your own tubing and, if you are connecting a fixture, the appropriate riser or connector for the outlet.
7) Is the 1/2 inch CTS on the Watts 3539B the same as 15 mm?
Watts lists the inlet as 1/2 inch, 15 mm nominal, which is the metric equivalent call-out for 1/2 inch CTS tubing. It is a nominal size designation, not a measured outside diameter, so match it to 1/2 inch CTS tube rather than to true 15 mm metric copper.
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts 3539B-10 come with a warranty?
Absolutely. The Watts 3539B-10 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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