All these autoclaves are made of 8 gauge aluminium. The drum is deep drawn. The lid is die casted. Locking of lid by 6 nuts with rubber gasket seal in between (no metal to metal seal). Two safety valves, pressure gauge, flexible metal tubing to exhaust air. Includes outer stand, inner tripod stand. Features: equipped with two stages "over pressure" protection system incorporating a calibrated continuous bleeding pressure stopcock and pressure release weight valve. Pressure gauge : colour coded pressure gauge showing internal chamber conditions during the cycle. Sterilization zone in green colour is shown from 15 psi to 20 psi (or 1.034 bar to 1.378 bar) which is equivalent to temperature of 121 c to 127 degree c. Dial size : 2.5". Dial show measurement in 2 units (i) kg/cm2 (ii) lb/inch2 full scale dial of pressure gauge is 0-30 lb/ inch2 or 0-2 kg/cm2 caution zone in red colour. Equipped with steam release /control valve and flexible metal exhaust tube. For assurance of each autoclave is tested to the parameter of successful sterilization. Optional "tst" indicator stickers provide independent verification that the correct combination of temperature, steam and time has been achieved for successful sterilization. All aluminium deep drawn seamless construction of base unit. Heavy cast aluminium lid with six wing nut. Easy to use top loading autoclaves. Fast 20 min.