i have been looking at gaslock solenoids on the internet a bit lately. most of the ones i have here have a 2.5mm hole in them. i found one on the internet that will handle 100 psi, works off 12 volts, has 1/4 npt fittings and a 4.5mm hole. is 100psi capacity enough ? i have a sneaking suspicion it isn't. anyone know ?

I think lpg is around 125psi. So definitely no.