Parker 65 Mark 1 Connectors

These compatible Parker 65 Mk 1 connectors are made in brass and will accept the larger 7.5mm converter

Length 21mm 

Large thread diameter 9.6mm [open end] which has a 3 start 48TPI thread    

Small thread 9.1mm diameter which has 48TPI Single start thread  thread

If you are unsure of which connector you need please look at the photos of both connector types before ordering by comparing the threads on each end to see if they look like the connector you are replacing