Versions of Washington Code 69.50.450 - Butane or other explosive gases on LawServer 2023 Washington Code 69.50.450 – Butane or other explosive gases 2022 Washington Code 69.50.450 – Butane or other explosive gases 2020 Washington Code 69.50.450 – Butane or other explosive gases 2019 Washington Code 69.50.450 2018 Washington Code 69.50.450 – Butane or other explosive gases