Nothing wrong at all, just ensure it's properly sealed.
Over flow drilled above fill valve
- Thread starter XanderHarris
- Start date
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Test that by filling up with water after fitted?
Nah, shouldn't need that. Just ensure the rubber seal covers the hole properly and that it's nice and tight. A little line of silicone on the back if the hole's bigger than the shank of the blank, just to fill the gap before the nut goes on and that should be enough.
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Should be fine, as long as it covers the hole of course 
Thanks what size drill bit is usually best when drilling the hole for the float valve tail?
Wouldn't have to worry about it getting out with it being plastic. Suppose the tank is too
Absolutely not - as long as the seal covers the outside of the hole completely on the inside of the cistern and the surface is clean and the plug tight enough then there shouldn't be a concern. That and the water shouldn't ever get there anyway, as it'll reach the overflow first.
If you bodge it and have a water leak bringing down ceilings etc. The insurance company can and will look for ways not to pay out. Just saying..... Some of us plumbers and heating engineers have a lot of paid for training and certificates, and public liability insurances to cover these things. Hence our prices reflect this and we do not like to bodge, just replace. No comeback or complaints/ claims.
Sorry but not sure what's defined here as a bodge? Sealing up the existing holes using correct fittings or repurposing them as long as the size allows isn't a bodge IMO.
Madrab, you know what you are doing. If the op has to ask, ok. Take a photo before you start work. Agree the plan of action with the customer. Carry out the work and photo on completion and keep for your own records. No leaks when you finished , jobs a goodun. If it leaks later on if someone else does something, you're covered. We live in a claim society.
Yeah, that's a fair shout.
Only thing I would say though is I guess it would be the same level of expertise to swap out the F&E cistern on an OV system as it would be to seal it up and change the inlet/overflow?
I guess though if someone is actually considering that level of work in and about a F&E cistern, then they should have at a reasonable level of expertise and be confident/competent in what they are doing. If they aren't then or course it shouldn't be attempted and get someone in.
Yes I feel competent to do it. Just wondered the best way as obviously installed wrong. Even thought of just putting a double check on the cold feed to the inlet and putting a part 2 full valve on. As this would protect to fluid cat. 3
Over thinking it regards the cat 3 double check valve. Re do correct way and cya
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