Absolutely. It's also good to research what materials will allow that to happen. Unfortunately plastic end plates are prone to warpage and thus can more easily leak under slight pressure. Hydrogen will leak very easily in the first place. Some good materials to look in to are:
- Tygon Norprene
- Buna-N (FDA)
- EPDM (be careful of the grade)
- Kynar
I don't use plastic HDPE or even UHMW PE anymore for the structural end plates because it can deform too easily and will get worse with heat. You want your reactor to be able to hold ~30 PSI without leaking and be sure to test it underwater for air leaks.