The H2S replacement gas is a non-refillable canister. To ensure the canister is disposed of safely you must puncture it. The canister disposal tool enables you to puncture the canister by placing the empty cylinder centrally in the tool and winding the handle until the canister is fully pierced.
Prior to puncturing, the cylinder must be completely empty. We recommend you follow the EIGA IGC document 30 Disposal of Gases before puncturing. This document is available as a free download from www.eiga.org.