THESE ARE BRITISH STANDARD PIPE CONNECTOR SIZES!

Please see below for explanation!

This listing is for a BSP threaded connector with a hose barb.

We have 4 options available:

Straight connector - barbed

90 Degree Elbow connector - barbed

Threaded connector - external thread

Brass connector - with internal and external thread - please check photo

We offer this item in 6 sizes and barb which is measured as the internal diameter of the pipe it fits. The thread size is measured as BSP thread and requires a hole size as stated below

1/2" bsp = 21mm hole

3/4" bsp = 26mm hole

1" bsp = 33mm hole

1.25" bsp = 41.9mm hole

1.5" bsp = 47.8mm hole

2" bsp = 59.6mm hole