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Reviews (2)

27 Sep, 2017
Needs a bit of modification for big garden use
For use outside where you might want a consistent slope over a long area the level sight tubes may not be long enough. I attached the clear pipe to two identical bits of timber with graduated scales o see drops of 40 cm and ended up not using the site tubes. They are best left attached though as they act as a buffer make the whole apparatus more forgiving in an overflow situation.
The tubing is relatively lightweight and easily kinked. It's important it isn't to get a true level. When first used filling hot water helps uncoil the tubing. I used some food coloring in the water to help see the levels. The effect is the same as using screen wash without the health hazard.

03 Dec, 2022
Good value alternative to a new TRV
If you have an otherwise functional old style TRV, replacing the head if its damaged saves a lot of time and hassle having to drain water from the central heating pipework to replace the entire valve. These replacement old style heads are expensive compared to buying a new TRV but are cheap compared to the hassle of fitting the entire valve. They can be fitted in just a couple of minutes.