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Not saying that all different manu's state that minimum hole diameter size. Just I've recently been fitting a few of these so had details handy.

Just had a quick look through a Potterton Gold MI's. Hole required for the flue (chimney) should be minimum diameter of 116mm.

I was born in the 80's :cry:

Sorry but I had the urge to correct you, probably the only chance I'll get mind :mrgreen:

Nah you wouldn't catch me trying to powerflush a microbore system lol. Was just stating what Kamco say mate. Lucky for me theres hardly any microbore around my area :D

SE duct

Ahhh I get the customer to cook me a full english whilst I'm fitting the first boiler :P

Some times you can fit 2 boilers in a day :P

Kamco say that you should connect up across pump conns. And double up on cleaner. They say it won't work when pipes are blocked, or if distributor pipe is broken on double entry rad valves then the flush will be minimal.

Screwfix, new radiator? :P

If your in a hurry you could hire a pipe freezing machine from HSS or Mr Plant Hire etc, should be about £50 for the day so cheaper than the £90. It should have that main frozen in like 10-15 minutes if you have enough room to fit both the clamps. Then replace your internal stopcock.

Someone has had too much vino :roll:

I'd advise the OP to contact Rentokil if there were rodents in his/hers loft !

BSS do a cheaper version of Armaflex which is good, think its called insultube or somin, can't remember. Armaflex has self-adhesive slits though which is good, saves using loads of tape.

Hilmor for me. Had mine for about 7-8 years and they were second hand when given to me. Have a look on Ebay and see if you can grab an old set, you may get a bargain. If you do get an old set just give the insides of the formers a good clean and they should perform nicely.

Whats wrong with my message? I'll be visiting family in Annan soon if you fancied meeting up to discuss gas matters :D

Whats wrong with a bit of mastic under a carsey? You ever tried ripping off an old basin thats had mastic pumped behind it? I hardly think someone is going to go flying off with the pan whilst squeezing out a turd! :P

A ballofix should be ok for a local means of isolation imho. Although I prefer lever valves.

Yeah I use a seperate bottle and hose/nozzle for when I'm soldering up 35mm - 67mm. Its just too bulky for bumping about from the van into someones home though for domestic work imho.

I wouldn't fit a gate valve on a cold main. Be better if you used a ballofix or stop cock.