●The usable range is vacuum-100kPa ●Body shape: 51 types in total ●Thread material/surface treatment (with or without): 2 types ●Optional surface treatment: brass (no gold plating), brass + electroless nickel plating ●Suitable for pipe outer diameter Round type Metric system: Φ2, Φ3.2, Φ4, Φ6, Φ8, Φ10, Φ12, Φ16 Imperial system: Φ1/8", Φ5/32", Φ3/16", Φ1/4", Φ5/16", Φ3/8", Φ1/2" elliptical Metric system: Φ3.2, Φ4, Φ6 Imperial system: Φ1/8", Φ5/32", Φ3/16" ●Connection thread Metric: M3, M5, M6 R, Rc: 1/8, 1/4, 3/8, 1/2 G：1/8,1/4,3/8,1/2 NPT: 10-32UNF,1/16,1/8,1/4,3/8,1/2 Uni：1/8,1/4,3/8,1/2 ●Sealing method Sealant/gasket seal Seal ring seal Gasket seal (Uni thread) Category: Quick Connector, Brand: SMC, Series: KQ2