We have resumed shipping to all addresses, including P.O. Boxes and fly-in communities. Please click here for more details.
The Biggest Tire Sale of the Year** is on now. Save up to 25% on select tires from Bridgestone, Michelin, MotoMaster and more. Conditions apply.
Shop NowThis paragraph should be hidden.
Pick up available 12:30 p.m., Oct 23
Only 1 left
Quebec residents: For information on maintenance and repair click here.
The Series 100XL operates behind the scenes to keep you safe and your hot water heater running smoothly. This temperature and pressure relief valve monitors temperature and pressure build up in your hot water tank, protecting against issues that could lead to damage or dangerous situations. With a bronze body construction and special coating on the thermostat, the 100XL detects when temperature or pressure rise beyond safe levels and automatically releases excess water so pressure and temperature return to normal, ensuring your hot water supply continues operating at peak efficiency for years to come.
Watts T and P Thermostatic Valve features a unique thermostat with special thermo-bonded coating
Thermostat element - 4" (10 cm), shank - 1-3/16" (3 cm)
Required safety device on all water heaters
Brass body construction
Prevents water heater from blowing up
Includes test lever and stainless-steel spring
| Part Number | 0066166 |
|---|---|
| Valve Type | Pressure Regulating |
| Connection Type | Male Thread |
| Primary Material | Copper |
| Primary Colour | Gold |
| Pipe Type Compatibility | Copper |
| Maximum Pressure (psi) | 150 lb/in² |
| Number of Pieces | 1 |
| Advanced Features | No Advanced Features |
| Certifications | ASSE Certified, NSF Certified, UL Listed, UPC Certified |
| Assembled Height (cm) | 6.35 cm |
|---|---|
| Assembled Height (in) | 2.50 in |
| Assembled Length (cm) | 3.81 cm |
| Assembled Length (in) | 1.50 in |
| Assembled Weight (kg) | 0.26 kg |
| Assembled Weight (lb) | 0.57 lb |
| Assembled Width (cm) | 19.69 cm |
| Assembled Width (in) | 7.75 in |
| Inlet Size (in) | 0.75 in |
| Inlet Size (mm) | 19.05 mm |
| Outlet Size (in) | 0.75 in |
| Outlet Size (mm) | 19.05 mm |
Only Show Differences | |||||
| Ratings | |||||
| Valve Type | Mixing | Mixing | Air Admittance | Mixing | |
| Connection Type | Sweat | Threaded | Male Thread | Threaded | |
| Primary Material | Copper | Brass | Copper | Brass |

When you visit any website, it may store or retrieve information on your browser, mostly in the form of cookies. This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalized web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer.
Canadian Tire Privacy Charter
These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. These cookies do not store any personally identifiable information.
These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies, the aggregated data will not include your visit.
These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies then some or all of these services may not function properly.