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It is worth mentioning that the rust was probably caused by condensation. This would happen due to low temperature water in the return pipe created by running the boiler with the thermostat turned down or the system not balanced to give a temp of 11 degree centigrade difference between flow and...

Yes.

I take it that you realize that, if the sewerage did back up and close this valve, that your toilet is likely to overflow when you pull the flush. :( :(

If you have installed the valve correctly, arrow pointing in the direction of flow, and the outlet joints are secure and not letting water in. It indicates that the valve is not seating properly due to debris or being faulty.

These are one way valves not spring loaded check valves. There is no problem submerging the brass valve in water for long periods. Why not get a copper copper 15mm compression valve and use a couple of 15mm copper tails to connect to the hose with jubilee clips. What head of water is the pump...

If you had fitted the valve just above the pump as I suggested you would not now be getting these problems,

Son :!: :!: thank you old man, I`ll take that as a compliment :D :D

Son :!: :!: thank you old man, I`ll take that as a compliment :D :D

It is known as a knurled nut try here http://www.accuratescrew.com/Nuts.aspx

Install a spring loaded check valve in the pipe work just above the pump.

OK o wise one, spill the beans :mrgreen: :mrgreen:

Spilled fat, gravey etc, on the burner in the vicinity of the thermocouple preventing the flame from heating it

I think that the OP is confused and that he means that the toilet PAN is being syphoned out, in which case it would indecate that there is no open vent or Durgo valve on the soil stack.

Not a good design, one pump could pull against the other when both on. this would cuase cavitation and if it was an OV system it would cuase water to be pulled down from the expansion tank and would cause pumping over via the expansion pipe, what size are the primary flow and retun pipes?.

The aerjec if not fitted correctly,(Click on spraggo to go to my profile to see a sketched image of the right connections),hence the reason for the air in your system.

CONNECTIONS

queries

http://www.wickes.co.uk/surrey-flange/invt/421901/

The rubber hose, usually supplied with the W/M will normally stop water hammer from the machine. Is this fitted?.

Try using 1/2" "Delta" tap washers