Parker A6VC6-MG Check Valve, Tube to Tube, Nylon, Push-to-Connect in-Line, 3/8"

Parker Hannifin A4VC4-MG Nylon VC Check Valve, 1/4" Push-to-Connect Tube x 1/4" Push-to-Connect Tube

Rykey 3/8" OD Quick Connect Push In to Connect Water Tube Fitting Pack Of 10 (Ball Valve+Y+T+I+L Type Combo)

Malida Quick Push to Connector, Water Tube Fitting,1/4" Tube OD x 3/8" Tube OD Reducing Straight Union,for RO Water Systems,Water Purifiers Tube Fittings,Pack of 10.

YZM Quick Connect fittings RO Water Filters set of 10 (straight,1/4" to 3/8"Tube OD)

John Guest Acetal Copolymer Tube Fitting, Imperial Single Check Valve, 3/8" Tube OD

John Guest 3/8" One Way Check Valve RO Reverse Osmosis Water Filter NSF Certified

PureSec 2019 Push to Connect Quick Fitting Combo 3/8-inch OD for RODI System(Ball Valve+T+Y+L+I Assortment Package, Pack of 10)

Neeshow 3/8" Quick Connect Water Purifiers Tube Fittings for RO Water Reverse Osmosis System Pack Of 10（Ball Valve+Y+L+I+T Type）+5 meters（15 feet） tubing hose pipe for RO Water Reverse Osmosis System

Malida 3/8 Inch Tube 5 Meters 16 feet white PE Tubing Hose Pipe for RO Water Reverse Osmosis