An air blown electric switch device suitable for an electric device includes a body, a pressure detector, and controlling circuits. Multiple protocols such as SCSI, IP, HIPPI, ATM among others can concurrently utilize the same media when mapped over Fibre Channel. Said dosing units comprise, respectively, a dosing piston which is mounted in a piston chamber, whereby the dosing piston moves at least in a rotational manner about the piston axis thereof. Both replacement skates have attachment means for fastening the skates to the scooter using the same pins and fasteners used to attach the wheels.