Load pressure fitting with M5-thread for 3mm vacuum hose (of brass),
SMC KQG2L06-M5 fitting, sus, male elbow, KQG STAINLESS STEEL FITTING
Push-in L-fitting QSML-M5-4 | Festo USA
246 M5 Male to M5 Male Adaptor Fitting with Rings - GSF N M5
Metric Male Thread M5 M5x0.8 to 5mm 3/16" in Hose Barb Fitting Adapter Connector | eBay
20 Pieces M5 - 4mm Elbow Pneumatic Pipe Air Hose Quick Fitting Mini Connector Iron - Pneumatic Parts - AliExpress
QSML-M5-6 Push-in L-fitting (Pack of 10) – Coast Pneumatics
Festo 153304 QSM-M5-4 Push-in Fitting, Nickel Finish, 2.2 mm Inside Diameter Minimum Order Requirement 10 / Order in Multiple of 10: Amazon.com: Industrial & Scientific