The new MK11 EVO/R105 is a simple, rugged and reliable air delivery system. The MK11 EVO is a compact balanced diaphragm first stage with a forged brass body fitted with thermal fins and protective plastic bumpers to ward off scratches. The R105 delivers smooth, dependable air flow from its classic downstream valve design. Built to last, the R105 features a durable metal valve housing and an anti-scratch front cover. Compact, air-balanced diaphragm design, MK11 EVO delivers top performance and reliability Forged brass body comes with metal fins to improve thermal exchange plus plastic bumpers to prevent scratching Innovative double spring layout increases performance while contributing to overall compactness Two high pressure ports are set on a 15-degree angle for convenient hose routing. Four high-flow low pressure ports increase airflow while maximizing hose routing options. CE Certified adheres to the latest EN250A European Standards for all diving conditions including extreme cold water. Product Resources Read First ManualEnglish. Product Manual Frequently Asked Questions