If your dealer or repair garage as advised you to replace your Air Compressor without offering a more cost affective solution to getting your vehicle back on the road! 4x4AirSeals are here to help. Your Discovery 3/4 or Range Rover Sport will have been fitted with a Oem Hitachi Air Compressor from new and over the years this unit can suffer from a air Leaks or a combination of air leaks around the unit causing the piston seal components to wear out resulting in a Dashboard alarm message! Immobilising your air suspension system to Normal Ride Height only in most occasions, if you have diagnostic equipment the code these issues usually generates a C1A20/ C1A1364/ C50 or C1A20-64 C1A20 being the most common conditions. If time is of the esscence and you are not sure what part of your Oem Hitachi unit is malfunctioning then this’ Master kit’ will rectify the common issues associated with the C1A20 Diagnostic code. Pressure not rising quick enough or Pressure does not decrease when venting gallery. Not copies of other companies products! Please study the listing kit in (Picture 1) as it forms part of the description , the kit fits the Oem Hitachi unit only. Air Compressor Serial Numbers. RQG500071 RQG500072 RQG500080 RQG500090 RQG500060 RQG500061 RQG500062 RQG500070. LR044360 LR01530 LR015303 LR023964 LR010376 LR045251 UUB504700 VUB504700RQG000017 RQG000018 RQG000019 RQL500040. The item “Discovery 3 Air Compressor Pump & Dryer Master Repair Kit Land Rover Hitachi” is in sale since Friday, December 23, 2016. This item is in the category “Vehicle Parts & Accessories\Car Parts\Suspension & Steering\Air Suspension & Parts”. The seller is “4x4airseals” and is located in golborne, Cheshire. This item can be shipped worldwide.