1. Technical Bulletin Bulletin No PRO 03 04 Effective Date 8 22 75 Page 1 of 1 Subject Pressure Relay Emergency Valves Off Highway Vehicles This is to advise you we have three high pressure relay emergency valves in the field used on off highway vehicles Piece Initial Emergency Max Emerg System Model No Application Press Release Press Pressure RE 4 279986 75 psi 5 125 psi 145 psi RE 6 283295 50 psi 5 95 psi 125 psi RE 6 284280 65 psi 5 110 psi 135 psi The RE 4 valve is now obsolete and superseded by the RE 6 valve 284280 The regular relay emergency valves cannot be used to replace the above high pressure relay emergency valves