Replacing Ball Valve In Header Tank Part 2!

[Booldawg]

My adjustable spanner wasn't big enough to bit the brass nut on the ball valve.

It must be around the 35mm mark. These are the 2 nuts either side of the tank that clamp the ball valve in place.

Does anyone know what spanner fits this?

[The Builder]

Boolders... I'm sorry I missed your part 1 I'm afraid.
Anyway, Central Heating header tanks are fed from the mains. If no other stopcock, then turn off at the mains.

This is all you need ...................

http://www.screwfix.com/p/irwin-vice-grip-10-groove-joint-pliers/49686
(Also called "water pump pliers")

Then one of these...............

http://www.screwfix.com/p/part-1-float-valve-brass/23847

[Booldawg]

thanks mr.builder will see if I can get my hands on one of those products! My adjustable spanner was slightly too small.

[Booldawg]

as a side note; what is the purpose of the header tank?