Stainless Steel Hydraulics Fittings - JIC Caps - 3/8 in.
Female JIC Fitting with Nut - JIC Hose Fittings - Rubber Fab
Tube Fittings Division - Parker
Amazon.com: 64 Pcs. JIC 37° Flare Thread Cap & Plug Assortment Kit, Seal Adapter Set for Hydraulic Hose Tube and Pipe, SAE AN Fittings, Galvanized Carbon Steel with Precision Threading, Dash Sizes