Flat face quick release connection coupler 
 
Engineered for heavy-duty plant machinery and excavator attachments, this flush-face quick coupling provides a clean, dry break every time, protecting your hydraulic oil system and the surrounding site environment. For hydraulic connections such as crusher buckets, breakers, grabs, etc.
 
Each coupler will have a female BSP thread the same size as the coupler, ie, 1/2" coupler will have a 1/2" female thread.