Thanks for the watch and the question! There are certain specs you need to know about your compressor before you can find the correct pressure switch. First, what is the cut-on and cut-off PSI settings of the compressor? You should be able to find this info on the manufacturer's site and if not, try giving them a call to see if they can give you this info. Maybe they can even give you the pressure switch part number or specs. Next, find out if you need an unloader valve on your switch or not. Most units DO use the Unloader Line which connects the tank to the pressure switch Unloader Valve (this is usually a 1/4" OD copper or nylon line). Next, figure out if you need a single "port" or thread on the bottom of your pressure switch (the manifold) or if you need a 4-way manifold. You can view the various pressure switches we have available on our site at the below link: mastertoolrepair.com/air-compressor-parts-pressure-switches-c-25_2.html

If you have the VT490000AV pump, you can view the full parts list and breakdown on our site by clicking on the below link. The air filter is reference number 12 on the diagram: mastertoolrepair.com/air-compressor-pump-parts-vt490000av-p-60726.html Thank you!