Industrial 3/8" Male NPT Air Compressor Hose Quick Coupler Plug. 3/8" male NPT industrial-style quick coupler plug for air compressor hoses. This is a heavy-duty plug constructed to be ultra-resistant to wear, scratches, and dents from drops and damage from dragging air hoses. This is a high-quality plug that does not disappoint! Features 3/8" Male NPT Threads Industrial Style Solid Construction Extremely Durable Resistant to Wear, Scratches, and Dents