To save your time：Before purchasing, please pay attention to confirm whether your model is listed in the description below or the dimensions in the product pictures, the outer diameter size of the vacuum gasket is approximately 12.55 inches long x 1.5 inches wide x 0.35 inches thick。 Designed for compatible with NutriChef PKVS Sealer PKVS18、PKVS18BK、PKVS18SL、PKVS20STS、PKVS25BK，series vacuum packaging machine replacement gaskets。（Not suitable for any other model） the gasket is made of a high quality foam blend that will restore your machine's suction power to 100%, DO NOT remove the rubber gasket. Recommend replacing once a year，we have 4 replacement gaskets for multiple replacements, saving more maintenance and replacement costs, which can ensure your machine performs at its best，Worry-free replacement every year。 Easy to install，Just simple steps to replace, no professional tools required，Replacement gaskets can effectively enhance the vacuum seal, and the size of each gasket is precisely designed to ensure a perfect fit and avoid air leaks。 Regular replacement of gaskets helps to extend the life of the vacuum packaging machine and maintain the good performance of the equipment.Improve the life of the vacuum machine