Emergency Release Valve and CO^2 Blow Down Bottle ( click here for a *.jpg pic ) — used as the Emergency Backup like the airlines and the military do in our Infinity 1 for lowering the retractable landing gear. Also being used in the Viper Jet, Glasair’s, Lion Heart, Radial Rocket and other Sport Aircraft. Just turn the ‘T’ handle clockwise to release the UP hydraulic pressure back to the tank / reservoir / or overboard, then continue to turn the ‘T’ handle to puncture the 850 PSI / 5 gal. vol. / ~1″ OD x ~4.5″ long / 38 gram with a 3/8″ x 24 pitch straight thread CO^2 bottle — the Emergency Release Valve is only $200.00 each via cash, check or money order / only $208.00 each credit card price, and the CO^2 Blow Down Bottle is only $25.00 each via cash, check or money order / only $26.00 each via credit card price, plus S & H , and CA Sales Tax ( if you live in CA ).