under what circumstances. Can lead to a thermostatic raddiator valve. opening up fully with out anyone turning it up. On its own?

If you unscrew the thermostat you may find the plastic collet that locates it is broken.this has happened to me. John

Will this fit as a replacement for a terrier model?

Hi, no, it won't fit a terrier valve.

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Myson Standard Thermostatic Radiator Valve Replacement Head Only (TRV 2 WAY)

Myson Standard Thermostatic Radiator Valve Replacement Head Only (TRV 2 WAY)

Product ID: 49528901

Details

Brand
Myson
Exterior finish
metal
Global Trade Identification Number
Inlet connection size
0.5 Inches
Inlet connection type
Compression
Item dimensions L x W x H
35 x 23 x 46

🔒Secure locking pins included

⚙️Precision 0.5-inch compression fit

🛠️Easy DIY installation

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KD 11.65

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Description

🔥 Upgrade your comfort game with precision control ⚙️

CERTIFIED QUALITY - Meets CE and RoHS standards for safety and environmental compliance
DURABLE METAL BUILD - Robust metal finish ensures long-lasting performance and premium feel
COMPACT LIGHTWEIGHT - Slim 35x23x46mm design at just 140g fits discreetly on any radiator
SEAMLESS COMPATIBILITY - Interchangeable with Myson 'Contract' heads for hassle-free upgrades
EFFORTLESS INSTALLATION - Simply unscrew old head and snap on new – no plumber needed

The Myson Standard Thermostatic Radiator Valve Replacement Head is a durable, metal-finished component designed for easy DIY replacement of Myson TRV 2-way valve heads. Featuring a precise 0.5-inch compression connection and secure locking pins, it ensures seamless compatibility and reliable temperature control, backed by CE and RoHS certifications.

Specifications

ASIN	B00HV2H6FW
Best Sellers Rank	27,276 in DIY & Tools ( See Top 100 in DIY & Tools ) 185 in Central Heating System Accessories
Brand	Myson
Customer Reviews	4.5 4.5 out of 5 stars (1,971)
Exterior Finish	metal
Global Trade Identification Number	05013131300234
Inlet Connection Size	0.5 Inches
Inlet Connection Type	Compression
Item Dimensions	35 x 23 x 46 millimetres
Item Type Name	Standard Head
Item Weight	140 Grams
Manufacturer	Rettig
Material	Metal
Model Number	2TRV HEAD
Number of Pieces	1
Outlet Connection Size	0.5 Inches
Outlet Connection Type	Compression
Part Number	2TRV HEAD
Set Name	Single
Size	1pack
Specification Met	CE, RoHS
Thread Size	0.5 inches
Unit Count	1.0 count
Valve Type	Thermostatic Valve

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