Five 5 Caplugs CCF-1-3/4-14-20 Black Plastic Plug for 1 3/4" 1.75 Inch OD Tube Fits 1 3/4" outside diameter tubing with 14-20 gauge (0.083-0.035 inch wall thickness). The three external rib lock design ensures a secure fit. Installs easily and securely. Made of high strength black plastic. Quantity of Five (5) plugs included per order.