Welcome to Glass-Holes. We are a couple of obsessive compulsive guys with backgrounds in engineering and plastic fabrication for medical uses. We manufacture professional quality aquarium accessories including overflow boxes, protein skimmers, calcium reactors, refugiums, sumps, and custom products. We personally test all of our products on our own systems. Please call or email if you have any special needs. We invite you to browse through our store and shop with confidence. Your satisfaction is guaranteed. If you don't like it, call us and send it back. Due to the many variables involved in the drilling of glass, including your skill level, we cannot guarantee your tank against damage caused by drilling. There are few things in life as enjoyable as aquariums. We do our best to provide products that increase water quality, and therefore good health in your aquatic friends. We hope you enjoy your stay.