1/2" x 1/2" Plastic Female Threaded Coupling — BascomMaple.com
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
Charlotte Pipe 2 in. PVC Schedule 40 Female S x FPT Adapter PVC021011600HD - The Home Depot