Check the listing for details. Industrial 1/4" Male NPT Air Compressor Quick Coupler. Condition: New. Listed at 6.95 USD. 1/4" male NPT Industrial style air compressor, quick coupler fitting. This is a top-quality quick coupler. Unlike others that only have 3 or 4 ball bearings to hold the plug end, this coupler has 6 ball bearings ensuring a long-lasting, snug, leak-free fit! This is a solid steel coupler that has 1/4" male NPT threads. Specifications: • 1/4" Male NPT • Industrial Style • Solid Steel Construction • 6 Ball Bearing Seal.1/4" male NPT Industrial style air compressor, quick coupler fitting. This is a top-quality quick coupler. Unlike others that only have 3 or 4 ball bearings to hold the plug end, this coupler has 6 ball bearings ensuring a long-lasting, snug, leak-free fit! This is a solid steel coupler that has 1/4" male NPT threads. Specifications: • 1/4" Male NPT • Industrial Style • Solid Steel Construction • 6 Ball Bearing Seal.