This is the Poseidon LP Hose Mk3 - 9/16-18 35.4" 90CM Features: Low pressure hose For Xstream and Jetstream Male end screws in to a first stage low pressure (LP) port 9/16" Material: Rubber (SBR/NR80) In order for the world&';s most reliable regulators to earn that name, they need hoses that are equally as reliable. The Poseidon low pressure hoses all do the same thing, they deliver air safely and consistently from the world class Xstream first stage to the servo-assisted second stages. Our low-pressure hoses are made out of rubber (SBR/NR80) and this makes them durable and reliable. All LP hoses are pressure tested at 35 bar/ 507 psi to ensure that the hose is properly assembled.