These are genuine original equipment manufacturer (OEM) parts, components and assemblies as supplied by Mares USA for the rEvo line of rebreathers. These are the parts we do not stock, but would Special Order for you, if you don't see the part you need please contact us. These parts are available as a special order. Due to their Special Order status, these items are NON-RETURNABLE. Your complete satisfaction is our goal, so please consider carefully before purchase.