Tighten specific law on the first hand clockwise filter bottle, so a half turn with a wrenches to normal tightness filter Bottle and filter Covers should have 1-2 mm Covers for all standard 10inch water filter housings for strong membranes cup design to cracking Produced of premium Component, strong & long for time service This wrenches slip onto this filter housing to aid in the replacement of filter cartridges, easy for using, Manufacturer: Fahou