LittleWell 1/2 in. Push-Fit x 1/2 in. Female Pipe Thread Brass Coupling (2-Pack) ACPF8FPT8X2 - The Home Depot
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
Amazon.com: NPT 1/2 Female Thread to 1/2 Inch Male Thread Pipe Fitting Converter Adapter Solid Brass 2 Pack : Everything Else