Amazon.com: RFaha 4pcs SMC to SMA Coax Adapter SMC Male to SMA Female RF Coaxial Connector(F135-4) : Electronics
SMC KFH06-01 Brass Insert Tube Fitting, Connector, 6 mm Tube OD x 4 mm Tube ID x 1/8" BSPT Male: Push To Connect Tube Fittings: Amazon.com: Industrial & Scientific
SMC KQ2E07-35A Brass Push-to-Connect Tube Fitting, Bulkhead Connector, 1/4" Tube OD x 1/4" NPT: Amazon.com: Industrial & Scientific