Material Brass Brand RUBY.Q Connector Type Plug Thread Size 0.25 inch Exterior Finish Brass Thread Type NPT Number of Pieces 2, 14, 4, 20 Manufacturer RUBY.Q About this item 【14 Pieces Kit】- Air coupler and plug kit includes 2pcs 1/4" FNPT coupler, 2pcs 1/4" MNPT couplers, 4pcs 1/4" FNPT plugs and 6pcs 1/4" MNPT plugs. 【Premium Material】- Quick connector air plugs are made of high quality brass, they are high strength, high hardness and durable for long term use. 【Connector System】- 1/4" NPT male thread and 1/4" NPT female thread are compatible for Industrial type M/D air plug, and the pushfit connector is suitable for the I/M, ARO, V type plugs. 【Coupler Sleeve】- Coupler has better grip when connecting and disconnecting, Deep-knurled socket with ball-locking helps reduce the risk of accidental disconnects and protects the coupler sleeve. 【Wide Application】- air coupler and plug kit is ideal for professional jobsites, in automotive shops or at home in the garage for air hose, air compressor, air tools, air nailer, air blow gun, pressure washer.