Plumbing help please

[Marksfish]

I am currently adding another 5 fish tanks to my filter system. I have borrowed a drill bit from a friend to drill the holes in the tanks, but it is only a 22mm bit, the other holes and fittings I have are 1.5"!! I went to a local DIY store yesterday and bought some toilet overflow connectors which

22mm rigid tubing fits in quite nicely. The problem lies in that I didn't realise the bore reduced to 20mm! I have tried the local plumbing stores and all say there is no such beast as a rigid 20mm pipe. Does anyone here know any different please?

Cheers

Mark

[BigWallop]

What are you drilling through ?

[Niall]

Plastic conduit comes in 20mm.

[Marksfish]

Glass, worked a treat!

[Marksfish]

Would that be held in general stock or is it a special order thing? I only ask because the 3 i've been to don't stock it.

Cheers

Mark

[chris French]

In message , Marksfish writes

This is plastic conduit as used for running electrical cables - you need to go to an electrical wholesalers, or some sheds sell it.

whether the fittings are all water tight though.....

[Dave Plowman]

Pretty well any electrical wholesaler worth the name should stock it, but it's usually called 'Egatube'

Think I've also seen it in a large B&Q.

[Marksfish]

Cheers Chris i'll have a look. It doesn't need to be water tight as the tubing will sit inside the tank. It is only to keep the water at a set height.

Mark

[Dave Plowman]

You can solvent weld it with the normal PVC stuff. Don't know how it would stand up to hot water, though.

[Lee Blaver]

Just a thought, but since it isn't manufactured with that intent in mind, would it automatically be suitable for potable water and safe for fish though? Any chance of plasticisers or other chemicals/lubes etc that could leach out... Or is that just being silly?

Lee

[Marksfish]

There is that potential yes, but it is a freshwater system so the chances are slim to middling. If I had a saltwater aquarium I wouldn't even consider it unless it was food grade plastic.

Mark

[Rick Dipper]

MDPE underground water pipe comes in 20mm, ask at the builders merchant.

You might have to buy a 50 meter roll .........

Rick

[Marksfish]

All sorted now, tanks for all your helpful comments.

Regards

Mark