We have your SpeedAire 4MU11 parts here. Whether you need a pressure switch or a whole new pump, we have your parts. SpeedAire4 MU11 parts are easy to come by at Master Tool Repair. We have helpful sales team members that can assist you with your repair. We have accessories as well as compressor oil to keep your pump running like a top. We keep the most popular SpeedAire 4MU11 parts in stock and we can order most other parts in a matter of a few days. To make ordering easier, we have created the ability for you to order parts by simply enlarging the schematic and then using your mouse to hover over the actual part. You will see the part pop up and are able to order by simply choosing the quantity of parts that you need. Make sure to keep spare parts on hand so that your down time will be minimal. Don't forget the rubber isolator pads for floor mounting. Oil and air filters should be replaced every 3 to 4 months, twice a year if used infrequently. Use straight 30W compressor oil. Drain your tank regularly to prevent rust, especially if climate has high humidity.