Pack of 10) 1-5/8" - 1-625 Inch OD Head Dia - (10-14 Ga - 1.36" - 1.45" ID) Snap-in Round Black Plastic Plugs w/Flexible Ridges | Fencing Post Tube Inserts | Fitness Eqpt. End Caps, Plugs - Amazon Canada
PARKER HEX HEAD PLUG - Hydraulic Hose Caps and Plugs - DYE1/2HP-SS | 1/2HP-SS - Grainger, Canada
2" Inch Square Tube End Plug Post Cap End Caps 4 Plugs per package | eBay
CAP PLUG KIT - Hercules for o-rings, hydraulic seals, cylinders