Cast iron water pipe > compression fittings?

[Mike2007]

I have a 1" cast iron water pipe supplying an old high level cistern. I want to chop it off low down and couple it to 15mm copper pipe to supply a new modern toilet. I know "cast" is joined with threaded fittings, so would it be possible to join like this? :/

thanks in advance

 

[buck51]

If you can find a joint in it further back, you can get a coper to iron adaptor,

 

[Nige F]

If it`s 1 inch OD. it`ll be 3/4 galvanised iron ( not cast ) so you`ll need a 3/4 adapter , as Buck said

 

[Mike2007]

Does that mean I can cut the steel or do I have to join in at nearest threaded steel joint available that will undo?

 

[Tibbot]

As the replies state, nearest threaded joint. If you cut the steel, you won't be able to join it to the copper.

 

[Biggles..]

Unless you use a primofit

 

[Boilerman2]

Or hire some pipe threading dies!!

 

[bobthebender]

a 22mm comp fitting will fit 3/4 galvanised.

 

[Biggles..]

No it won't.

3/4 Galv is internally 3/4 with an outside dia of 1.05 inch.

22mm compression fits 22mm copper which is measured od.