How to install the check valve

1, locate. Draw the size of the exhaust passage opening with strokes. 2. It's opening. According to the position of the mark, use a hand-held cutter to cut. 3. Leveling. Use a hammer to smooth and clean the contact surface between the valve and the pipeline. 4. glue. Apply glass glue to the back edge of the valve. 5. Install the valve. Put the valve into the hole and fix it with the fastening screw. 6. clean it up. Clean up the excess glass glue. 7. check. Check whether the pumping plate is in place and whether the valve can be used freely.