quick coupling 1.material:iron,plastic 2.for tractor 3.pipe joints 3.different types quick couplingused to connect the pipeswith different types and high qualitywe are mainly engaging in heavy-duty trucks' parts,like HOWO ,STYER and some parts ofBenz,volvo,scania,man & etc.We also produce many parts for tractorscustom-made service is offeredwelcome to make order Quick Coupling for Tractor