The Gaslow Rubber Hose comes in a range of sizes. They are checked and approved with an extractability rating of 2%. However, the rubber hose leaves a plasticiser residue on regulators so stainless steel hoses are advised. Hoses fit into the inlet of every 30 mbar caravan/motorhome regulator including Gaslow changeover systems using the W20 connection. They should be changed every 4-5 years and have a male POL connection suitable for UK butane cylinders.