It sounds as if the cartridge is the least of your problems. If you cannot build enough air pressure to inflate your suspension due to a faulty purge valve you need to fix that first.
You may want to consider replacing the whole air dryer with a rebuilt unit. Ebay often has these units available or you can order online from places such as RyderFleetProducts.
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John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
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