Description Description Freudenberg Sealing Technologies (formerly Tobul) Gas Bottles (Forged Carbon Steel Shell) without internal gas bladders are a cost-effective approach to providing additional gas volumes to selected systems. Generally, these pressure vessels with hemispherical ends are readily available in the marketplace, and can sometime lead to a lower initial cost. Available only in a limited selection of sizes, though, multiple units may be "banked" (e.g., installed on a common manifold or header) to provide the required cumulative volumes. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories