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A pony bottle is a smaller tank which is carried in addition to the main tank. It possesses its own regulator with first and second stage and sometimes a separate pressure gauge. It will is mounted either at ones side or in front of the body or fixed to the main tank. A pony bottle scuba tank is the only true redundant breathing mechanism you can completely rely on.Depending on the type of diving you plan on doing will determine what capacity the redundant air supply needs to be. Leisure Pro offers five different size bottles to meet every divers requirements. If used for sport diving there are three choices 6 13 and 19 cu ft cylinders. If deep or deep technical diving or wreck penetration or cave diving there are the 30 and 40 cu ft cylinders available.The Pro Valve is one of the highest flow cylinder valves available today and is also a convertible valve. Whether you dive Yoke or DIN regulators this valve will work for both. Valve has easily removed 200 bar 3000 psi DIN insert to convert the valve for use with DIN regulators. Valve has a heavy duty deign with a smooth operating mechanism and multi-ported burst disc plug for added safety.Aluminum cylinders unlike steel cylinders don’t rust they oxidize. The oxidization of aluminum forms a protective coat that hinders the continuation of corrosion making aluminum cylinders less likely to be condemned due to excessive corrosion. The available cylinders have the following physical specifications:Diameters:6 cu. ft: 3.28.13cm13 and 19 cu. ft: 4.3811.13cm30 and 40 cu. ft: 5.25 13.34cmHeight:6 cu. ft: 10.827.4cm13 cu. ft: 12.832.5cm19 cu. ft: 17.4044.2cm30 cu. ft: 19.9850.75cm40 cu. ft: 24.8563.1cmWeight:6 cu. ft: 2.6 lbs 1.18kg13 cu. ft: 5.7 lbs 2.59kg19 cu. ft: 7.8 lbs 3.5kg30 cu. ft: 13.7 lbs 6.2kg40 cu. ft: 15.9 lbs 7.2kgBuoyancy Full:6 cu. ft: -1.5 lbs -680.4g13 cu. ft: -1.7 lbs 771g19 cu. ft: -1.3 lbs 589.7g30 cu. ft: -2.4 lbs 1.1kg40 cu. ft: -2.6 lbs 1.2kgNote:All Catalina cylinders are nitrox ready and meet certificated specifications of the US Department of Transportation DOT with DOT-3AL specification and Transport Canada Safety and Security TC with TC-3ALM specifications. Purchasers should check with other country requirements to know if the cylinders are certified for use in that country.