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The UDME and associates Dereefer, model DM-500, Part No. 811-00289 is a 100 percent mechanical mechanism, designed to accommodate a wide range of cargo parachute types and sizes. It has specially designed to be be a "re-usable" substitute for the "use-once-and-throw-away" M-21 pyrotechnic cutter.

The DM-500 has been designed to fit perfectly into the existing M-21 mounting bracket, no modification required.

The timer offers a choice of preset delays of two to four second. Access to the timer external setting screw is quick and easy.

The timer mechanism is sealed against all outside elements. The internal subcomponents require no maintenance and are corrosion resistant throughout.