Horiznext npt 1/2 (means the inner diameter of the thread is 3/4 inch) cast female taper threaded pipe coupling, stainless steel 304 coupler for mush tun cooler and shower hose, 2 pcs - Amazon.com
HF0049 + HF0050) 1/2" Female NPT Thread 1/2" Body Hydraulic Coupler ISO 5675 Ball Valve Quick Connect - TEMCo Industrial
Air Hose Quick Change Snap Coupler Female for 1/2 Inch NPT - Walmart.com
Amazon.com: (4 Pack) Besosay 1/2 Inch Hose Barb to 1/2 Inch NPT Female Thread Fitting, Brass Quick Connector Coupler Adapter Reducer Air M Type Fitting, Quick-Connect Fitting : Industrial & Scientific