3/8" Tube O.D. x 1/4" MPT, Push Connect, Inch Stem Adapter - 1180X6 - Hi-Line Inc.
GE Push-On F-Type Connector, Coax Connection (50-Pack) 51211 - The Home Depot
Amazon.com: 1 Piece W5SWL Brand Premium Series Push-On PL-259 Adapter Slip-On UHF Female to UHF Male Quick Connect (-NOT for Cable or TV-) : Electronics
File:Push-on-Adapter.JPG - Wikimedia Commons
Worldwide Tee Adapter Valve with 1/4" Push-to-Connect Fitting
Lumax - LX-1409 Push-Type Adapter
EK-Quantum Torque Push-In Adapter M 14 - Nickel – EK Webshop
File:Push-on-Adapter.JPG - Wikimedia Commons
John Guest 3/8 in. Push-To-Connect x 3/8 in. MIP Polypropylene Adapter Fitting 803239 - The Home Depot
3M™ PELTOR™ Push-To-Talk (PTT) Adapter Military Radio FL5601-02, with 6-PIN MIL-C-55116 Connector, 1 EA/Case | 3M United States