So after buying http://www.ebay.co.uk/itm/291475988288?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

 

 

After reading on here that it fits, it is tiny compared to the nut on mine ... i only bought this as im desperate for a new washer. I would just like to confirm that this should fit. Before i assume mine has been rethreaded bigger.

Measure the one they've sent, across the outside of the threads. They've probably sent one that doesn't match their description. Use open-ended spanners to measure if you don't have a micrometer or vernier calipers.

It looks like the correct one.

http://www.awesomegti.com/ecs-magnetic-drain-plug-with-10-copper-washers

It looks like the correct one.

http://www.awesomegti.com/ecs-magnetic-drain-plug-with-10-copper-washers

 

That one looks a lot thicker, than the one i posted.. but i cant see any sizes on awesome' s site.

 

I notice on the page i bought it from, the red one which i received looks a lot smaller than the black one further down the same page.

 

I think problem is solved, im glad really that i dont have to start guessing nut sizes.