Making an intake box water/dust proof?

[Tom Cardy]

I am fixing a snorkel to help my truck breath some cleaner air on the dusty trips while also being able to ford some deep water. Any tips for making an airbag dust and water proof? Are there any upgrades available on the market or do I have to modify mine?

 

[XJ Jeep]

In my opinion you best option is to go for a stainless steel sealed unit mate