Frizzlife feed water valve. White polypropylene with food grade EPDM o-rings, connects between valve and riser to the main water supply line for application in reverse osmosis, filtration systems, automatic coffee brewers, and ice-makers. Not for use with compressed air, explosive gases, petroleum spirits and other fuels, or for heating systems. Sizes indicated are thread male compression x thread female compression x tube OD. Including: TEE UNION ADAPTER: Size: 3/8" Thread male x 3/8" thread female x 1/4" tube quick connect with compression. Fitting A : 1/2" male NPT and 3/8" female NPT threaded connections Fitting B: 3/8" male NPT and1/2" female NPT threaded connections If your water angle valve is 1/2" OD, use both TEE union adapter and two fittings to connect the angle valve and water hose. If your water angle valve is 3/8" OD, only use the Tee union adapter to connect the angle valve and water hose. Water Systems feed water angle stop valve adapter has 3/8” male and female compression and two NPT thread 3/8" to 1/2" converter fitting for easy installation on most under-sink cold water supply and faucet water lines. The ¼” Tube OD quick connect fitting allows for easy connection to reverse osmosis systems water filter, ice makers and other potable water applications.