item number 1025 is a canister filter with three-quarter inch threads this filter attaches to any 3/4 inch hose threads in a head assembly the filter should follow directly after the backflow preventor after the filter the pressure regulator will be attached remember all items in the head assembly only need to be hand tightened over tightening with wrenches can cause them to crack and thus leak while in use the last item in a head assembly is the tubing adapter this is where tubing will be attached picture here is a 1/2 inch tubing adapter the proper sequence when installing a head assembly is a backflow preventer followed by a filter then a pressure regulator and lastly the tubing adapter this filter has a detachable cap that allows you to drain the filter if necessary simply unscrew the cap allow water to drain out and then screw the cap back on this filter has a removable screen that can be accessed by unscrewing the body of the filter which makes checking and cleaning the screen simple other filters require you to undo the filter from the head assembly in order to clean the screen we recommend checking the screen of your filter regularly this is what will keep debris from entering your system and clogging drippers so it is important that the screen is cleaned and working optimally you