White Angled Thermostatic TRV & Lockshield 15mm x ½" (31811)

£ 12.64INC VAT

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White Angled Thermostatic TRV & Lockshield 15mm x ½" (31811)

Chrome-plated designer valve and lockshield.

  • Liquid Sensor
  • Bi-Directional Valve Body
  • Compression Connection
  • Frost Protection
  • Positive Shut-Off
  • 1 Year Guarantee
  • ½ Turn Operation
  • Includes Lockshield

More Info

View all: Essentials Thermostatic Radiator Valves

£12.64INC VAT

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Rated 5 out of 5 by from Best Value For Money They Do exactly what they need to. Straight forward installation for any heating engineer or general DIY’er.
Date published: 2022-09-30
Rated 5 out of 5 by from Best TRV for price and quality Always fit these TRV sets they’re reasonably priced good quality and Screwfix do a replacement TRV head set. In my opinion at half the price of its competitors the TRV is easily as good as Drayton or Danfoss. I’d recommend given this valve a try and see for yourself.
Date published: 2022-09-23
Rated 4 out of 5 by from Basic unit, reasonable price Purchased for use in bedrooms were the settings will be reasonably fixed, so these budget units will work fine.
Date published: 2022-09-12
Rated 5 out of 5 by from Very handy Great product, exactly as expected and did the job perfectly. Not much else to say but would definitely recommend and purchase again. Thanks
Date published: 2022-09-08
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Inlet and Outlet Connection Sizes different?

Probably a silly question but it says that the Inlet size is 15mm and the outlet size is 1/2". Does this mean I have to track down an imperial connection for this also?
Asked by: floop
probably too late for you but someone else may benefit. the 15mm is the pipe size coming in. the 1/2" refers to the connection to the rad which are measured in BSP (British standard pipe)
Answered by: ADProjects
Date published: 2022-09-23

Thermostatic head 31811 almost imposible to turn

Have installed one of these for my elderly mother but its so tight it cannot be turned easily, Any suggestions to make it looser.
Asked by: rosebush
Hello rosebush, It appears that your product may be faulty, please take your product to a store of your choosing. To help you find a store here is our store locator https://www.screwfix.com/jsp/tradeCounter/tradeCounterPage.jsp. Thank you for using Q&A
Answered by: ASTENT
Date published: 2022-09-07

Lockshield head handle

Does the lock shield come with a head that can turn the lock shield on and off or to adjust without a spanner? God bless
Asked by: hogsidecar

Wiser Radiator Thermostat Compatibility

Would these TRV bodies work with the Wiser Radiator Thermostat (9953V) heads?
Asked by: Catalyst82
Yes, I fitted one last week. Simple screw fit. No additional adapters needed.
Answered by: iharding160
Date published: 2022-08-20

Can this be used to replace the thermostat of a Drayton RT212?

I am hoping to change just the thermostat without having to replace the entire valve.
Asked by: Kcknhrs
Hello, Thank you for your enquiry. Yes this item should be compatible because the treads are the same. Thank you for using Q&A
Answered by: Jclarke71
Date published: 2022-07-21
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Angled/Straight Connection Angled
Brand Essentials
Colour White / Chrome
Frost Protection Frost Protection
Inlet Connection Size 15 mm
Inlet Connection Type Compression
Manufacturer Guarantee 1 Year Guarantee
Max. Working Pressure 10 bar
Outlet Connection Size ½ "
Outlet Connection Type BSP
Pack Size 1
Parent Colour White
Pieces in Pack/Case 1
Product Type TRV & Lockshield
Radiator Valve Type Thermostatic
Sensor Type Liquid Sensor
Smart Compatibility Not Smart
Temperature Range 6-28 °C
Valve/Lockshield Included Valve & Lockshield
Valve Body Material Chrome-Plated Brass
Wheelhead Colour White
Wheelhead Material Plastic


Instruction Manual