42mm Tank connector ?

[Ian3266]

Hi all

I have a relatively simple query to which I cannot find any related info on the net, curious

I have a small stainless boiler with a circular hole in it (on a flat section) of 47.65 mm (I cannot alter this). I need to attach a short length (about 1 mtr) of copper pipe to this to form a watertight connection, there is little pressure involved, maybe a little but not significant. It also needs to be relatively easily removable.

42mm pipe would be ideal and a tank connector immediately springs to mind but I cannot find out the hole size required for such a beasty without buying one, does anyone know the answer ??

thanks in advance

 

[TicklyT]

47.65mm is a tad tight for 1½" BSP, but only just (1½" BSP has a major diameter of 47.803).

1¼" BSP has a major diameter of 41.91 mm.

the two sizes are commonly used for sink and basin wastes.