... cap and Latch with chain): 1.Material : Aluminium 2.Size:1.5'', 2'',2.5'',3'' 3.casting technique:gravi Guillemin coupling(cap and Latch with ... chain): 1.Name:Guillemin coupling cap+Latch+chain 2.Material: Aluminium 3.Thread ... casting8.Aplication:military, oil, colliery, fire control, chemical, industry,agriculture and other fields.