not over tighten the connector to prevent damage to the port. At this point, you are ready to begin the inflation process.If your pump has the “bed fill” feature, depress that button on either control to fill the chamber automatically. If your pump does not have this feature, press and hold the “Firm” or “^” button until the chamber is completely inflated. On digital inflators, the reading will be approximately 50mmHg. For analog air inflators, the pump will begin to slow and create a sputtering sound.