2 Pcs G3/4 x G3/4 Pipe Fitting, Brass Hex Nipple Connector, Hex Nipple Connector, Male to Male Straight Thread Pipe Fitting, Solid Brass Double Nipple for Plumbing, Heating, HVAC, Gas Pipe Connections

Flomasta Hexagon Nipple 3/4" x 3/4" - Screwfix

PATIKIL 304 Stainless Steel Pipe Fitting, 1 Pack 3/4" BSP Male x 3/4" BSP Male Threaded 3" Length Nipple Cast Pipe for Extending Piping, Silver