Designed to help release air from the filter and test the pressure of the filter. Easy to replace and use. Remove the broken one; Put the o-ring on the valve tail, remove the top plug; Wrap the gauge thread with telflon tape, and screw the gauge onto the top of the relief valve Features: High flow manual relief valve is very easy to install & screw to the filter. No needs for any actual tools. Simply screw the gauge plug with some telfon tape & put the rubber O-ring onto the threaded section of the tail end & insert the valve with some telfon tape right in the place of the filter to avoid leaking Turn the air relief valve on until you hear the air within the filter being released. Turn the valve back to its original position once the air and water sprays out. The Relief Valve will make sure no air is in filter Made of sturdy & solid plastic material, our High-Flow Manual Relief Valve is very sturdy for you to use for a longtime. There are also two non-slip rubber o-rings insider the valve to keep the valve have a more stable performance High Flow Manual Relief Valve is compatible with XtremepowerUS, Warrior, FNS, SMBW 2000 series and 4000, Clean and Clear, Quad DE 60, 80 & 100, & All-Predator Filters Specifications: Type: Replacement Air Relief Valve Compatible Model: XtremepowerUS DE 75202, 75221 & 75222, 75205 & 75206, Warrior, FNS, SMBW 2000 series and 4000, Clean and Clear (CCP100, CCP320, CCP420, CCP520), Quad DE 60, 80 & 100, & All-Predator filters, 188592, 188593, 188594, 160316, 160317, 160318, 160301, 160332, 011555, 147411, 180007, 180008, 180009 Package Include: Relief Valve Pressure Gauge Gauge Plug O-ring Telfon Tape Manual