H&S Airbrush Holder - Expandable Module System H&S Airbrush Holder - Expandable Module System designer shaped airbrush holder, the basic version version holds two airbrushes but can be expanded indefinitely with the Harder & Steenbeck Extension For Airbrush Holder Every module has it's own air supply for each airbrush These following H&S Airbrush Holder - Expandable Module System hoses connect the holder to your airbrush via a quick release system. The hoses are available in Clear or Braided versions Harder & Steenbeck Hose with Quick Release to Fit Airbrush Holder H&S Airbrush Holder - Expandable Module System Braided Hose with Quick Release to Fit Airbrush Holder If you are only connecting one airbrush/hose to the Airbrush Holder then the other outlet can be sealed off with theAirbrush Holder Blanking Plug Fits Harder & Steenbeck and similar airbrushes. Please note that the holder can only be connected to an air source via an airbrush quick release coupling body.