Tube Connect Quick Fitting 1/4" PT to 1/4" OD for RO System Water Filter Pack of 5

Tube Connect Quick Fitting 1/4-Inch PT to 1/4-Inch OD for RO System Check Valve Water Filter Pack of 5

Lemoy Equal Straight OD Tube Ball Valve Quick Connect Fitting 3/8-Inch by 3/8-Inch OD Valve Start RO Water System (pack 10)

ANPTGHT Plastic Hose Barb Fitting, 1/4" Barb X 1/4" NPT Male Thread Adapter Connector Pipe Fittings for Fuel Gas Liquid Air (Pack of 5)