Flat face couplings, connectable under residual pressure. Real 35 MPa (5076 psi) max working pressure. ISO 16028 interchange. Zinc-Nickel plating.
It's possible to couple either a 3FFH female half under pressure with a FFH male half, or a 3FFH male half under pressure with a FFH female half.
3FFK parts are a more compact version (20 mm shorter body) of 1/2" 3FFH male halves, offering same technical performances.