VIEW AIR RELIEF ASSEMBLY - The Air Relief Valve is secured with a nut on the underside of the Air Relief Assembly. To remove the Valve from the Assembly you must first remove the Assembly from the tank. The Assembly has "LOCK" and "UNLOCK" labels on top of the tank. To remove the Assembly you will have to rotate the Assembly counter-clockwise from the "LOCK" position to the "UNLOCK" position.
SECURE AIR RELIEF ASSEMBLY - Place the Air Relief Assembly on the top of the tank so that the tab on the Assembly lines up with the "UNLOCK" label on the top of the tank. Then twist the Assembly clockwise 1/4 turn until the tab lines up with the "LOCK" label. You may have to use a strap wrench to twist the Assembly.
CHECK READING - Check the pressure reading on the Pressure Gauge. It should read about 10-15 psi. When the pressure moves up to 10 psi or so higher, it is time to backwash your filter.