Half inch Stainless Steel Pipe Fitting Half Coupling (150 NPT Female) - Mile Hi Distilling
Southland 1/2 in. Black Malleable Iron FPT x FPT Coupling Fitting 521-203HN - The Home Depot
Charlotte Pipe 1-1/2 in. PVC Schedule 40 S x S Coupling PVC021001400HD - 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
2-1/2" Black Steel Sch 40 Coupling (Female NPT Thread)
316 Stainless Steel, 1/2 in x 1/2 in Fitting Pipe Size, Half Coupling - 2UA17|4307001508 - Grainger