These fittings are for the connection of items that have a female BSP parallel thread ie a Druck pressure module, Many of the druck products use BSP parallel thread so this is a good option. The 1/8 is the most common and then allows you to connect in a hose or go to another fitting via a union. The 1/4 one goes nicely into those SI and Fluke hand pumps. We stock these in all the three sizes from 1/8 through to 3/8 BSP. Product code: QTHA-RS
