→ For Female 4BD4FH Manifold Block (48mm Thread Diameter) → Allows connection under pressure → Flush face valve design minimizes fluid loss and air inclusion → 5,076 PSI Pressure Rating → Compatible with all standard 1/2" Body ISO 16028 Couplers → Flush face valve design minimizes fluid loss and air inclusion → Flush face valve design minimizes fluid loss and air inclusion → Locking sleeve to prevent accidental disconnection To check to see if this coupler will fit your machine, you will see a FFI or FI stamped onto the manifold block. The outside thread diameter of this coupler is 48mm (1-7/8″) .