Method for manufacturing sealing device

A method of manufacturing a sealing device, comprising:

• providing a mold having a molding cavity, a surface of the molding cavity defining a seat;
• inserting a reinforcing ring into the mold;
• and
• injecting a rubber material into the mold to form a seal body on the reinforcing ring,
• wherein the reinforcing ring has a shape that corresponds to a shape of the seat such that, in a pre-injection state, a portion of the reinforcing ring mates with the seat while another portion of the reinforcing ring is spaced apart from the seat by a first distance, and
• during the injecting of the rubber material into the mold, a pressure of the rubber material on the another portion forces the another portion toward the seat such that, in a post-injection state, the another portion of the reinforcing ring is spaced apart from the seat by a second distance that is less than the first distance.