it can be used in case of bad air suply.the slide made of derlin in the reversing valve is solid and durable,and not easy to be damaged.smooth air channel.it is the reversing valve that can be totally subjected to external maintenance.compared wit other diaphragm pumps, the moving partsare very few.the reversing valve does not need lubrication.the pilot reversing valve has very high mechanical life.the day-after-day operation can be ensured.
