PLCS designs these on our CAD system. They are usually custom fabricated from steel in two halves, which are bolted together on the pipe.
The pipe is prepared by grit blasting and priming
The sealant is mixed and poured into the mold.
The mold is capped and then pressurized with bottled nitrogen to above mains pressure. A gauge registers the sealant pressure. The nitrogen pressure is left on for 24-48 hours and then the mold is removed.
The steel mold belongs to you and can be reused many times.
Field technicians are available for on-site instruction and supervision.