Air compressor check valve, 1/2" Compression x 1/2" MPT with 1/8" hole; plug hole if not needed.  https://mastertoolrepair.com/1-8-blk-steel-plug-s-h-100b6e/ If the small unloader (bleeder) valve on or under your pressure switch leaks constantly...

Protect your pump from damage by keeping clean or replacing.

Keep your air compressor from sliding all around your vehicle or floor. Order extra for future use.Specifications Height: 3/4"  Diameter: 1-1/2"

1/4" NPT wingnut drain cock. Prevent rust from ruining your air compressor tank by draining your tank daily. Keep an extra around for a spare.Extra DetailsThis was a new check valve installed less than a year ago. Due to the tanks not being drained, this...