Features: Medical material, safe and non-toxic; Strong resistance to acid, alkali, salt corrosion ability; Under 25 ℃ ~ 60 ℃ environment, the performance is normal and has good ductility. High adsorption properties, thermal stability, chemical stability, high mechanical strength, etc. Description: Shell material: ABS resin Membrane material: silicone rubber Diameter: 9.5-10 mm Total length: 43 mm Opening pressure: ≤ 0.5 Kpa Maximum back pressure: ≥ 0.3 Mpa Note: Size for manual measurement, there may be an error of 0 to 1 cm, belongs to the normal phenomenon omen. Box contents: 1 x valve.