The 150LX regulator is similar in design and performance to the 200LX but without the PVD Plating and diver inhalation adjustment. The 150LX delivers great performance at a moderate price. A great travel the world design or for those divers looking for great performance and certified to 40% oxygen. The second stage front metal ring, packing nut & end cap are all made of 316 Stainless Steel. The LX regulators come standard with Hollis’s Lifetime Warranty, 2-Year Service Interval and Free Parts for Life