This all in one kit contains everything that you would need to maintain, service, and repair your reverse osmosis system. Contains 50 GPD membrane, o-ring, check valve, (2) 1/8" male x 1/4" female quick connect (all for the RO housing), 5 micron sediment filter, 5 micron carbon filter, GAC filter, 3 filter housing o-rings, filter wrench, auto shut-off valve, (2) 1/4" male x 1/4" female quick connect fittings, (2) 1/4" male QC x 1/4" female quick connect elbows, in-line carbon taste & odor filter with 1/4" quick connect fittings, 1/4" PTFE tape, (2) membrane-to-carbon taste & odor filter clips, and (10) 1/4" white tubing. Only if don't need all these parts, the extras would be great to have on hand.