Guillemin coupling was also refered to Symmetrical half coupling, or French coupling. The symmetrical design ensure the same ends on both ends of the hose, and the collar prevent hose blow-off. It is widely used in France and in Belgium to couple fire hoses.   Heyday's guillemin coupling are available with serrated/helical hosetail, male/female threads, or cap/ dust plug.      Material are from forged brass, stainless steel, aluminum and polypropylene, size from DN20-DN 150.    
Applications 
Guillemin Couplings are widely used in irrigation, chemicals, petroleum products, powders and granulates, liquid fertilizers.
Material
1.Stainless steel AISI 316/1.4408 by investment casting
2.Brass CW614N by forging
3.Aluminum by gravity casting
4. Polypropylene
Main gaskets
Aluminum alloy: NBR-seal oil and petrol fluids resistant, white.
Brass: NBR, white
Stainless steel: Hypalon
We can also supply EPDM, viton and PTFE on the request.
Features
1. According to standard NF E 29572
2. Pipe thread according to EN ISO 228-