The Apeks XL4+ Octo is a compact and lightweight regulator, perfectly suited for the travelling diver. The XL4+ first stage is based on the dependable Apeks DS4 platform, offering excellent performance in a streamlined package. Paired with the XL4 second stage, you'll experience smooth, effortless breathing at any depth. The included Apeks Octo provides reliable alternate air source performance, mirroring the quality and dependability of the primary second stage. This regulator set is designed for cold water use thanks to its innovative over-moulded endcap and diaphragm, which helps prevent ice build-up in extreme conditions. If you're seeking a high-performance, travel-friendly regulator system that won't weigh you down, the Apeks XL4+ Octo is an excellent choice.