Kaplan Scuba Aluminum Cylinders Kaplan Scuba Aluminum Cylinders Kaplan Scuba will be transitioning to Catalina Aluminum Scuba Cylinders in the first quarter of 2020. We are excited to work with Catalina and continue to bring you the quality and service you expect in an aluminum diving cylinder. Nitrox-ready for gas mixtures up to 23.5% oxygen. Download PDF