| 摘要 |
<p>Product of plastic material comprising a socket portion (10) having a sealing ring (18) to seal against a pipe end inserted into the socket portion. The product is made by rotational molding and has an annular end surface portion (12) defined by the mold, and is combined with an injection molded ring (14) of plastic material which is secured by positive engagement to the socket portion, the sealing ring being pressed against the surface portion defined by the mold, to seal the joint between the ring formed by injection molding and the product formed by rotational molding.</p> |
