I need a safty seal to lock so pressure can start the seal broke off so now I can't build up the pressure. It's the safty valve inside the cover . it's a heavy rubber seal where can I buy some of those seal need about 6 for supply if it happen again. Name Hubert Madore 64 Parker terrace North Easton Ma.02356 Tel. number 508 238 3059 please let me know thank you .