Below is a list of Rubber Gaskets manufacturers from Upland, California. Rubber gaskets are rubber products used to seal spaces between two surfaces. Such seals are necessary in many kinds of equipment, especially those that involve tubing and hoses through which liquids or gasses pass. For example, when two sections of tubing meet, their point of connection must often be sealed by some kind of gasket material to ensure that no fluid leaks out though their connection point.