Has anyone had an experience with Tower TRVs? I bought 8no last year and installed them about 9months ago. About two weeks ago one started leaking, it leaks from around the 'pin' on top of the valve and leaks unless you set the head to maximum temperature. I contacted the supplier who sent me a replacement but before i had chance to fit the replacement i noticed a second valve has also started leaking, again from around the 'pin' but this one leaks even if i remove the head completely. I've contacted Tower who say i've just been unlucky and got two faulty valves? Has anyone else had any problems with these valves? They're not expensive but i'm wondering whether its worth fitting the replacement or just getting a different make of valve?? The supplier tells me they sell 100s of them, they're one of their best sellers so there must be plenty of them out there?