On Sat, 20 Dec 2008 11:00:32 +0000, Stephen wrote:

Hello,

Following on from my bath waste thread, I really don't like plastic
backnuts!

What size of backnut fits which waste?

Is it a simple matter of getting a 1 1/2 inch backnut for 40mm waste and
1 1/4 inch for 32mm waste?

Is a 1 1/2 inch backnut 1 1/2 inches across the nut's faces, or is it
the diameter of the hole?

I measured the plastic nut on my bath waste and its about 50mm af, so I
wonder whether for a 1 1/2 inch waste whether I actually need a 2 inch
nut? So it's not as simple as matching the nut size tot eh pipe size.

BTW, where can I get a 50mm af spanner to fit?


You really don't need to tighten them up so hard that you need them made
from brass.

The size is standard in that one of the 2 trap sizes always fit one of the
2 waste sizes. /If/ is it BSP then the size would be 1" and 1.25" having
approx 32mm and 40mm diameters.

A good pair of water pump pliers set to their largest size should do a
good job of tightening the back nut.

Note that some wastes will require some sort of thread sealant (tape, cord
or resin) on the threads in the 'target' section to make a seal.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html