Silicon grease can be used over time to optimize lubrication on the threads of the Outex glass component flanges.  

Quick tips and tricks for cleaning and maintenance of the Outex underwater photography system. Avoid petroleum based products - they can shorten the life of the Outex covers. This is silicone oil, which we sell on our shop, or you can easily find online or at your favorite scuba/dive shop. For more, please visit www.Outex.com/FAQs in the Frequently Asked Questions.