Help with pipe connection sizes.

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Stirlingshire
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United Kingdom
See attached image.

I need to connect a toilet cistern to the mains inlet, Plumber got all the pipework in place with isolating valves, I now have to connect it.

A. elbow joint, would this be a 3/4 inch female to male and would I use PTFE tape to seal it on the cistern side? The flexi hoses appear to come with a rubber washer inside.

B. Would the flexi hose be 3/4 inch female to female?

Both the mains inlet and the cistern are 20mm OD.
pipe connect.jpg
 
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who knows where you got that idea from but totally wrong just use a 15mm flexi hose
 
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Am I confusing the end fittings thread diameter with the diameter of the flexi pipe?
In other words a 15 mm flexi will have end fittings to fit the 20mm outlet.
 
The thread on your WC filling valve ( float valve ) is 1/2 inch BSP thread. The thread on your isolation valve is the same. The flexi hose to join the two directly would be 1/2 inch bsp ,both ends. ( I wouldn't recommend you use that directly onto an isolation valve though ).The flexi hose in your pic has a compression fitting at one end,should you wish to use that type ,you would need a 15mm compression to 1/2 inch bsp flexible hose. The compression end would need a short piece of 15mm copper tube fitted between it ,and the isolation valve ( and an olive and nut ,as none showing in your pic )
 
Last edited:
Yes it does. Is your cistern concealed ( fitted inside a cabinet ), with a side entry float valve ? If so ,is there enough space between the cistern and cabinets side wall to accommodate the angled flexi ?
 
Yes it is concealed, out of interest why shouldn't I "The thread on your isolation valve is the same. The flexi hose to join the two directly would be 1/2 inch bsp ,both ends. ( I wouldn't recommend you use that directly onto an isolation valve though ) put it directly on to the isolation valve as I thought the rubber washer would seal it.
 
The iso valve does not have a flat mating surface for the rubber washer ,but is tapered on it's inside edge to accommodate the olive, so over tightening onto a rubber washer can split the washer.
 

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