Wide series of Reverse Osmosis Quick Fittings with different tube size and thread size. High quality of RO quick push fittings. Wide series of Reverse Osmosis Quick Fittings with different tube size and thread size. High quality of RO quick push fittings.RO Fitting is used in the water filter,water purifier,water filtration industry.The detailed size is below: Reverse Osmosis Quick Fittings