Used for HVAC at 25 micron vacuum and 200psi and they don't leak. I always add some compressor oil to the fittings, maybe that does the trick. You need good tubing to get 25 microns. You don't have to over tighten them for a vacuum as the vacuum will strip the seals.
Enhanced Elitech ILD-300 Infrared Refrigerant Leak Detector: Advanced HVAC Halogen Tester with Selectable Gas Functionality
9 Review
VIVOHOME 220LB HVAC Electronic Digital Refrigerant Charging Weight Scale – High Precision with Protective Case
9 Review
💪 Enhanced Universal R134A Valve Core Remover/Installer by Mastercool (81290)
9 Review
🌬️ UView Airlift Cooling Checker 550000
9 Review
Bit and socket set Stels Tool set, 1/2", 1/4", CrV, plastic case 94 pcs, Stels, 94 pcs, black
46 Review
Reversible Mi 16-in-1 Ratchet Screwdriver
21 Review
Cordiant Winter Drive 2 255/55 R18 109T
33 Review
Xiaomi Mijia Ratchet Screwdriver 16 in 1 Screwdriver with Interchangeable Bits, 10 pcs, Black
22 Review