-For liquid pipe line, sewer, and electrical wires that connect between the coil and coil hot. This is a little trick that should not be overlooked in the punch Hole saw is used in drilling by drilling a small flower to the Middle drill position marks, drill a hole first and then changed to a blossoms Hole saw with a diameter of approximately 2 inches. The tube is enough to pass out. Adjusting the listening station, drilling, drilling into steel. If you are listening to a drilling function gives birth to bump the wall cracks and holes drilling, there will be a slight tilt to wastewater flow and every time, use a vacuum cleaner sucking up dust while drilling explosion to disseminate prevention.
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