Introduction
Since it is necessary to replace all related sealing parts at once, this guide will cover replacing both parts located around the air plug at the bottom of the tool. For this, you will need a 3-Gauge Allen wrench.
Tools
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Positioning the nailer so the air plug is facing towards you, use a 3-Gauge Allen wrench to remove the three screws.
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Removing the both the air plug and the belt hook, you should see the gasket resting on the air filter.
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Around the base of this will be the O-Ring. Replace the worn O-Ring along with the worn Gasket.
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Conclusion
To reassemble your device, follow these instructions in reverse order.