SharkBite 1/4-in OD Push-to-Connect x 1/4-in Compression Female Adapter in the Push to Connect Fittings department at Lowes.com
20Pcs Plastic Tee Push To Connect Fittings 3 Ways Tube Connect Push Fit For Multiple Pipes Union Tee Hose Connectors - AliExpress
Amazon.com: TAILONZ PNEUMATIC Black 1/2 inch OD Tee Plastic Push to Connect Fittings 3 Ways Tube Connect Push Fit Push Lock PE-1/2(Pack of 10) : Industrial & Scientific