This low pressure hose UNF 3/8″ is used to connect the Cyklon second stage regulator to its first stage. The connection point between the Cyklon second stage and the hose is of a unique design and is not the same as most conventional second stage regulators currently manufactured, so this hose is not appropriate for non-Cyklon regulators. Popular lengths: 70cm / 27.5″ for sport/recreational regulators 110cm / 43.3″ for stage/deco regulators 215cm / 84″ for technical “long hose” regulators 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. Note: An adapter (#2415) would be needed to use this hose on older first stages with G 1/8 port threads. Contact us for more information.