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
1/2 G Female Threaded Pipe Fitting to Clamp OD 50.5mm Ferrule 2 pcs - Walmart.com
Premier Mounts 1.5" Threaded Pipe Nipple (White) CLSW B&H Photo
Steel, Zinc Plated, Internally Threaded Rod - 2DLY9|LINK28018IZ - Grainger