The Mac Union, also known as a BSP union or threaded union, is mostly used to access BSP threaded pipework.

Mac Unions are made up of three parts; the Female-Male Union Part, Female-Female Mac Union Part and O-ring seal. These are supplied as one unit with an EPDM Seal included but we do have PTFE seals available if required. 

The union features a flat face so pipework can be slipped into place when installing, with an o-ring seal positioned at the connection point. Because this is a flat face, it is important to ensure your pipework is straight to prevent leakage. 

Our Mac Unions are manufactured from 316 grade stainless steel which is suitable for all environments including marine applications. Like our other BSP Threaded Fittings, the maximum pressure for our Mac Unions is 150 lbs.