Farmunion 5pcs Automatic Tire Deflator Adjustable Brass Tyre Set 4x4 Off-Road 6-30psi 4Wd Made from 100% brass material to eliminate rust Adjust tire pressure from 6-30psi. in 3psi increments Can be used on any standard valve stem Manual start/stop valve built in Easily disassembled to clean out sand or dirt