Four gas tanks can be connected to provide gas to two furnaces. You can also connect only 1/2/3 gas tanks. Features: 45 quick-loading gas tanks interface, quick locking gas tanks, seale-d and airtight. The interface of the stoves is accurate thread cutting, and it has the function of automatic air closing. There are independent gas adjustment switches on both sides. With a handle for easy carrying and remove. There is a folding bracket at the bottom, which can keep the gas output in the gas tanks when unfolded. There is a leak-proof rubber-ring in the extension hose. The outer layer of the extension hose is braided with steel wire, and the interior is made of flame-retardant rubber, which is resistant to stretching and has fine airtightness. Specifications: Type: Z54, Z58 (optional) Material: aluminum alloy+brass+stainless steel Fueltank size(fold): 280 * 45 * 50mm / 11.0 * 1.8 * 2.0in Fueltank size(unfold): 280 * 45 * 70mm / 11.0 * 1.8 * 2.8in Extension hose length: 285mm / 11.2in Fueltank weight: 625g / 1.4lb Extension hose: 50g / 1.8ounce Package size: Z54: 280 * 50 * 45mm / 11.0 * 2.0 * 1.8in Z58: 290 * 20 * 20mm / 11.4 * 0.8 * 0.8in Package weight: Z54: 650g / 1.4lb Z58: 60g / 2.1ounce Packing List: Z54: 1 * FuelTank Z58: 1 * Extension Hose