How to decide the type:4/6/8/10/12 means the o.d of the pipe you use.Thread : M5=5mmThread : 01=1/8''≈ 9.5mm±0.2Thread : 02=1/4''≈ 12.7mm±0.2Thread : 03=3/8''≈ 16.5mm±0.2Thread : 04=1/2''≈ 20mm±0.2Material: 304 stainless steelSealing ring: ternary fluorine rubberModel: PC chrome steel brief couplingMaterial: 304 stainless steelThread: M5, PT 1/8 1/4 3/8 half of external thread internal threadUse PU pipe size: 4/6/8/10/12mmMaximum pressure: 40 barWorking temperature: -20~200 levels CelsiusIncluding packaging: 1 connector