Founded in 1995, China Dongda Power Industry Co., Ltd. is one of the few nitrogen cylinder manufacturer and distributor in China that has patents on the generator, motor, power supply, engine, alternator, diesel and gearmotor design, supply and sale. Our custom nitrogen cylinders has obtained the certifications of ISO9001-2000, GS/TUV, CE, VL, EPA, QHS, SON, CAP and SRS and we have won EPA 2005 Motor Year Certification. Our 30 QC staff carefully performs inspections at every stage of production, from the time we receive raw materials to packaging. Noise, power, and stability are tested to ensure that our engines can endure 580 hours of constant use. We also can design and deliver OEM/ODM samples in one month.

All of the machines pictured are the ACTUAL MACHINES for sale - these are NOT stock photos These are all low friction needle roller bearing pivot point machines with KEVLAR belt drive systems. Some have NITROGEN cylinder seat adjustment systems and heim joint pivot points. All pads and finishes are excellent used condition unless noted otherwise. The machine pictured to the left is the Nautilus 2ST Bench Press with independent operating movement arms. This is one of the best selectorized bench press machines ever built. The independent arms allow an infermetic type of exercise OR a straight pressing motion. Boxers and Martial Artists love the independent action that duplicates a punching motion. Let the pictures describe the machines - This machine is just about perfect. All machines have shields on the user side, and some have shields on the other side, but the machines were intended to be backed together or against a wall so some machines will not run outer shields.

This 5 lb. cylinder is rated to work with nitrogen. Unlike CO2 cylinders, the valve has a female connection, which mates with nitrogen regulators. You may also fill nitrogen cylinders with "beer gas", a blend of CO2 and nitrogen. The OXARC HIGH CAPACITY 4500 psi cylinder gives you up to twice as much gas in a single cylinder! It's larger capacity translates into savings for you - savings in time, in product, in space, and in money! This cylinder has double the capacity of most conventional cylinders. It will hold twice the gas volume of the regular "K" style of cylinder and 50% more than the "T" style of cylinder. Let's assume that you use 10,000 cu ft of oxygen each month. If your oxygen is now delivered in "K" size cylinders, that's 40 cylinders that you handle and store on site. The equivalent in the OXARC HIGH CAPACITY 4500 psi cylinders would be 20!