Using your Makita High Pressure Quick Coupler is easy. First, make sure your Makita AC310H High Pressure Compressor is turned off. Then, simply thread the coupler onto the compressor. Next, connect your high - pressure hoses to the 1/4' connection of the coupler. When you need to change hoses, just use the quick - change feature to swap them out quickly. As for maintenance, regularly check the coupler for any signs of wear or damage. Keep it clean and dry to extend its lifespan. Also, always use it with the Makita AC310H compressor as other models may not work well with this coupler.