Pressure Switch, 125-155psi, single port with unloader valve. Note: possible replacement for the 034-0172. If your unit does not have an unloader valve, then you will not need to hook up the unloader line.
This item fits the following models:
15-pc Thunderbolt Black Oxide Drill Bit Set
1/4" x 50 Ft Noodle Air Hose with Coupler and Plug