The unique design of the Coilhose 1/4" In-Line Preset Regulator, 90 PSI (4214-90PS-DL) provides a compact method or setting air pressure to pulse style tools such as a nailer or a stapler. By installing the preset units on a tool, it prevents tampering or unwanted adjustment of tools in a production setting. The adjustable units are perfect for easily setting fastener depth in trim carpentry or even framing, rather than continual trips back to the job-site's compressor. Please Note: For use with nailers, staplers and other intermittent air tools.