Brass Pipe Fitting,3/8 Inch NPT Male to 1/2 Inch NPT Female Brass Pipe Hose Tube Fitting Hex Head Bushing Adapter Convert(5, 3/8 NPT male x 1/2 NPT female) - - Amazon.com
Amazon.com: T TANYA HARDWARE 1/2" NPT Male x 1/4" NPT Female Brass Pipe Fitting, Hex Bushing, Reducer Adapter (5 Piece) : Industrial & Scientific
Amazon.com: Quickun Stainless Steel Reducing Hex Bushing, 3/4" Male NPT to 1/2" Female NPT, Reducer Bushing Pipe Hose Fitting (Pack of 2) : Industrial & Scientific
Amazon.com: Quickun Stainless Steel Reducing Hex Bushing, 1" Male NPT to 1/4" Female NPT, Reducer Bushing Pipe Hose Fitting (Pack of 2) : Industrial & Scientific
Amazon.com: C CLINK 1/2" NPT Solid Brass Drain Plugs commonly Used in Boat Hulls. 2 Pack Solid Brass Boat Hull Spare Garboard Drain Plug : Sports & Outdoors
SDTC Tech 2-Pack Brass Pipe Fitting 1/4" NPT Thread Male to 1/2" NPT Thread Female Reducer Adapter - - Amazon.com
Amazon.com: Carvedexquisitely Stainless Steel Internal Hex Countersunk Male Thread Pipe Plug Connector, 1/2" NPT Male (pack of 2) : Industrial & Scientific