pipe sizes - advice

[stev]

Hi all,

There's a small pipe running fresh spring water into a tub for animals to drink from, it runs under a summer house im trying to renovate. Pipe is 25mm in diameter, but internally is only about 16mm diameter.

I'd like the water to do different things before heading into the tub, including filling a small pond, and also providing a tap in the summer house for as and when needed. So im wondering what pipe size to use (and go and buy) which will work outside and in, and be compatible with lots of fittings. I ask because I've struggled to find anything that will fit current pipe.

I've bought a y splitter, which has 25mm and 20mm fittings, and I've also got some reducers that fit into current pipe and on the other side go to 19mm. Is 20mm internal diameter quite common?

Hope I've made sense, just don't want to go ahead with incompatible pipe sizes!

 

[stev]

I should say I'm thinking about this:http://www.diy.com/departments/polypipe-mdpe-pipe-dia25mm-l25m/184651_BQ.prd

Apparently it has an internal diameter of 20.4mm so hopefully would fit over the Y splitter (which is 20mm). Anybody recommend MDPE for this sort of thing?

 

[sissy]

That is similar to what is inside my house blue for cold and red for hot and uses a special tool to clamp it to connectors .Out side from the well they use a 1 inch and that is split down to 1/2 inch size

 

[j.w]

stev

 

[Big Lou]

Welcome stev.

 

[stev]

Cheers guys, just to let you know that I ended up going with 25mm OD (20.4mm ID) MDPE pipe, which kind of worked. Realise now that most of youse are from across the pond (I'm in UK) so I imagine different pipe sizes all over. Here's a pic of what I'm filling up to see if it leaks: https://picasaweb.google.com/lh/photo/fRKl4nRZWVWRXIstiGK_PdMTjNZETYmyPJy0liipFm0?full-exif=true