GF+ MALE THREAD ADAPTER PVC-U 20MM X R3/4" (721910557)
Iwata Big Mouth 20mm Adapter Cap
Amazon.com: JENSWILL 20mm/0.78" Length Extension Pipe Arm Stainless Steel G 1/2 Male to G 1/2 Female Thread Adapter Cast Pipe Fitting Coupler for Shower Head Arm : Industrial & Scientific