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Just sourced a Fireboy Xintrex solenoid locally for half the price of the Trident. You need to know your fitting particulars to the tank and the regulator. most are 1/4 in some are 3/8.
You can check out the Fireboy system at their vg web site google fireboy xintex.
I have a Hunter but am also sourcing a new solenoid as mine's gone. These are the primary suppliers for everyone. I also found a generic one at Binnacle.com for same price as the Fireboy.