we are offering silicone vacuum cup with metal release valve etc. The silicone vacuum cup with metal release valve is made of high- grade & food-grade silicone rubber. The cup is autoclavable at 134oc degree (as per international standard). The metal part is made of stainless steel. available size: 40 mm, 50mm, 60mm, 70mm available colours: white, green & as per customer's special requirement..