TW, there is multiple ways mate. I used what is called a bulkhead fitting, do a google image search to see what it is. But I welded mine in for a better seal. Or you can use a purpose made weldable fitting, that I happen to sell lol, which is made for both pyro fittings and boost fittings.
Either way it good though. just weld it in though if you use the bulkhead fittings. They seal a lot better that way.






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