Features: 1)sliding spring loaded sleeve on the coupler must be manually retractde to connect or disconnect acept industrial interchange plug 2)application: Compressed air and low pressure fluid lines Specifications Includes: 1> 2pc Female Quick coupler(brass) 2> 1pc Air blow gun(Zinc Alloy) 3> 2pc Female plug(brass) 4> 4pc Male plug(brass) 5> 2pc blow gun needle 6> 1pc safety high volume tip 7> 2pc safety blow gun tip 8> 1pc double female connector 9> 2pc double male connector 10> 1pc Needle inflator 11> 1pc Air gauge 12> others packing :double blister