The pressure switch for a Sanborn air compressor is no longer available for purchase as of 2015, according to the Sanborn Compressor website. The website recommends purchasing the manifold conversion kit which is available online for $89.58.
The Sanborn Compressor manifold conversion kit does not replace the part but provides the work-around to keep the compressor working. The kit may require additional parts to work with the air compressor unit. Full installation and video instructions are available on the website. Other online parts stores offer pressure switches that may be compatible with the Sanborn model. To ensure correct parts, have the compressor's model number available.