At present there is one stopcock for 4 houses which are supplied with
lead. Whilst doing the drainage for my extension, I want to replace
the section under the new slab and into the house with MDPE pipe.
Outside and underground, I want to install a stopcock (depth around
750mm) with lead on one side and MDPE on the other. I may have to
leadloc to MDPE so that the stopcock is MDPE both sides I guess. Where
would I get a solid metal underground stopcock in a shaft for this
purpose ?
Also, how is the MPDE installed underground - insulated, in pea
shingle etc ? Can it rise unprotected through a new floor slab into
the house ?
Cheers,
Simon.

sm_jamieson wrote:
Also, how is the MPDE installed underground - insulated, in pea
shingle etc ? Can it rise unprotected through a new floor slab into
the house ?

It certainly needs to be insulated as it comes up though the ground, to
comply with regs. I did this a few years ago and am trying to remember
the details... certainly I had United Utilities crawling all over the
intstallation and they were about as anal as any official I've come
across - they were incredibly fussy about having the incoming pipe at
the proper depth, with insulation and mechanical protection. ISTR I
bought a purpose-designed sheath from TP for this - it was like a length
of drainpipe with a 90-deg bend, with a length of hollow-cored
insulation down the middle - this came up through the slab and would
theoretically permit a future replacement MPDE pipe to be pushed through
without disturbing the slab.

I can't remember whether this precise arrangement was compulsory or not.

David