With all the topics on inline water traps, I decided to try mine out in various positions and these are my thoughts and findings. With the trap attached to the gun you get good grip. If you have more then one gun, you will need one on each gun. I've also seen that it affects the air flow. It is as if the air build up in the filter and the first time you press the trigger, the pressure is higher then what you want. Also, if you turn the air down before it reaches the trap, there might not be enough power to so that you can let the water out of the release valve. This way you loose the nice fat grip. You will only need one filter for all your guns providing you use the same hose. The airflow what you set at the MAC valve is what you get out of the gun. Also you get the full use of the power to get rid of the water in the trap.