Prefabricated 3/4" plywood template with 3/4" plywood backing to make drilling holes for the H2Overflow® or Siphon Stopper® return fitting easy. Clamps and drills are not included.
Since glass Glass Hole Cutters do not have a pilot hole or a mandrel, it is very important to use a template to keep the hole centered.
It is recommended to clamp the template firmly with a fresh piece of backing for each hole (just keeping rotating and flipping the backing after each hole) to prevent chipping the glass on the other side. Also use a coolant (water) while drilling.
Please read our hole drilling instructions for more details. All holes drilled at your own risk - Please read our hole drilling disclaimer.