Over flow drilled above fill valve

[XanderHarris]

Went to a tank were I need to swap the fill valve the over flow is higher then the full valve. I was going to put a part 2 on it but still won't have an air gap. Any one come across one poorly installed before.
Thanks

 

[HERTS P&D]

Move the overflow lower down.

Andy

 

[XanderHarris]

Drill a new hole and blank the old hole?

 

[ChrisJP]

It's admittedly not ideal because the water in the tank will cover the fill valve before it overflows. But it'll still work as an overflow and stop water coming over the top of the tank, so it may not be worth doing anything about it.

 

[XanderHarris]

It's admittedly not ideal because the water in the tank will cover the fill valve before it overflows. But it'll still work as an overflow and stop water coming over the top of the tank, so it may not be worth doing anything about it.

Thanks I may need to fit a new valve on it as not shutting off fully.

 

[Madrab]

Do it right IMO - is it an F&E cistern?

Mains needs to be protected against backflow so the overflow defo needs to be below the fill valve. You may get away with enlarging the fill valve hole for the overflow and glue a plastic washer/piece of plastic and drill new hole to take the new fill valve in the overflow hole. Water shouldn't ever get to the fill valve anyway if the overflow is below it.

Worst case is plug up and drill a new hole as you suggest.

 

[XanderHarris]

The fill valve should just swap ok for another full valve. Was going to take it fully out and put a part 2 valve on it.

 

[XanderHarris]

Do you mean may get away with putting the over flow were the fill valve is. And putting the fill valve were the over flow is.

 

[XanderHarris]

Ah but the the over flow hole will be a bigger hole

 

[Madrab]

Do you mean may get away with putting the over flow were the fill valve is. And putting the fill valve were the over flow is.

Ah but the the over flow hole will be a bigger hole

glue a plastic washer/piece of plastic (over the overflow hole) and drill new hole to take the new fill valve in the overflow hole.

 

[XanderHarris]

The part 2 float valves don't come with a rubber seal. But I could just use a rubber seal that comes with a day toilet fill valve?

 

[JimCrow]

Remove the existing ballcock and plug the hole with with this brass plug and poly washer and the 1/2" backnut from the old ballcock, drill a new hole higher up for your new ballcock, no need for a 'rubber seal' on the new ballcock.

Plug

Washers

 

[XanderHarris]

Good Idea would plastic possibly do a similar job?

 

[XanderHarris]

I also thought about the option of putting a double check valve on the inlet as this is ok to protect against fluid cat. 3.

 

[XanderHarris]

Do it right IMO - is it an F&E cistern?

Mains needs to be protected against backflow so the overflow defo needs to be below the fill valve. You may get away with enlarging the fill valve hole for the overflow and glue a plastic washer/piece of plastic and drill new hole to take the new fill valve in the overflow hole. Water shouldn't ever get to the fill valve anyway if the overflow is below it.

Worst case is plug up and drill a new hole as you suggest.

Would there be anything wrong with using a plastic toilet cistern over flow blank? Or is metal better or is it because of the thread sizes being different