IN LINE WFF REVERSE OSMOSIS MINERALISING CARTRIDGE Adds Back Essential Minerals Elements To RO Purified Water Quick fit connectors not included with this item and if you need more we have them listed as item number 130861082062 Reverse osmosis removes essential elements and minerals and this filter adds back these back All our filters and systems have the relevant nsf.org, wqa.org or fda.gov quality standard approvals As mentioned earlier this item needs ¼” npt threaded to ¼” tube [outside diameter is +/- 6mm] quick-fit connectors. You’ll need to apply 6-10 laps of plumbing tape on the threaded side of the fittings before use. Most people have a roll of plumbers tape on hand but if you don’t we sell a 15 meter roll on as item number 131310583559 and if you buy this item as well as the plumbing tape at the same time we will send them together. According to regulatory standards any water filter system under constant water pressure [regardless of the brand or supplier] is required to be fitted with an AS3497 approved pressure reducing valve and back-flow prevention device which we have listed separately as 111633967085 and we also recommend that a leak detector shut off device is installed with any water filter and / or reverse osmosis system which we have listed on it's own as 121161074068 and we have both listed combined to save $'s as 111608203363.