A wall assembly includes at least one horizontally extending rail having a rear surface adapted to engage the wall. An available bandwidth value for the link is determined. The contact leg of the clamping spring has a recess for insertion of the electrical conductor, and an end of the clamping leg extends through the recess. A valve assembly having a ball lock assembly and a needle assembly controls the release of medication from the high pressure hose into the hand piece and out a nozzle into the subject. The television receiver then generates the EPG display from the modified EPG data and transmits the generated EPG display to a display device.