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Yep, got it. Re-read your initial post where you do indeed confirm they're TRV bodies. Going for the VT200, I think. Cheers Vulcan.

Yep, understood. Ta. Good to know that I don't have to faff about fitting new valves if I don't have to. Or paying for a professional to do it. Am I right that the VT117 bodies can accept VT200 heads? I'm also assuming those bodies in the photos are 15mm, but I'd need to check.

Hang on. If these are old VT117 valves as previously identified in the thread, they are already TRV bodies, no?

Bugger.

Bit of a resurrection on this one, chaps. So I'm getting round to sticking TRVs on one end of these radiators. I've seen these at a decent price: Schlosser Diamant Plus http://schlosser.com.pl/en/offer/thermostatic-heads/ However, there are different models in the Diamant Plus series - not...

Just to say we now have a great shower, thanks to you chaps. Good job!

Good idea. Where did I put the vinegar...

Ah, got it. Great stuff folks. Thanks. Just need to find those stopcocks...

Thanks chaps. Appreciated. One thing - which part is the 'plug' Davey is referring to?

Hi folks. So I'm thinking the hot and cold feeds have been plumbed in the wrong way round on this Bristan mixer. (Combi boiler installation.) I'm no plumber, but as I understand it, hot should go in on the left (i.e. the bottom feed in the photos) and cold in on the right. If that's the case...

Right. OK. Good stuff. So I'll stick a proper thermo head on one end and lock down the other. So what's the best end to stick a thermo head on? Inlet or outlet? Inlet I presume? (And am I right in thinking the pipe that heats up first is the inlet?)

This is what the head looks like. It's adjustable (in that it screws up and down) but it doesn't look as if it senses temperature!

Good skills, chaps. I'll have a look at locking one off with a screwdriver as suggested. Are these bi-directional valves? i.e. is doesn't matter which one I lock off?

Hi there. Just moved into an older house to discover that all the radiators appear to have old thermostatic valves... at both ends. I'm no central heating engineer, but shouldn't one end have a lock-off valve? Aren't the two valves just sort of fighting with each other? Any advice on how to...

Radiators, vaves, etc.