This heater cover instantly rejuvenates ugly old, yet perfectly functional, baseboard heaters. The end caps are designed to snap onto its panels. All premium series end caps (closed, open, and zero clearance) are made from super heavy-duty 18 gauge steel. Each end cap can contribute an optional 1.75" of the additional span when attached to a panel. Baseboarders Premium Series Closed End Caps are available on both left and right (sold separately) sides. They are designed for heaters with pipes that bend down into the floor or back into the wall. They do not continue into an adjacent wall. Designed to snap onto the ends of Baseboarders Premium Series panels only. The panel holes are 1/8” in diameter to allow proper airflow. Intended for hydronic (hot water) baseboard heaters, but will work for electric baseboard heaters. Use basic precautions when using electric baseboard heaters, as they operate at higher surface temperatures. Baseboarders' products will become just as hot as the original.