The 20 oz. bottle with on/off (Smart) valve is used with the Jet Paks (ARB and Lovell T-case) and is an upgrade for the construction Sidearm Systems. The reason is to be able to shut the air off without removing the regulator. The only way to shut the valve on our "pin valved" bottles is by removing the regulator. This type of Smart valve is required for the Jet Paks and can also be used with our Power Tank Minis and Sidearm Systems. All of these bottles come with a thread protector. We recommend using one at all times as one drop WILL ruin the valve without one. Note: Color is Powder coated Team Yellow.