The Scubapro MK11 First Stage DIN Regulator streamline body is constructed of machined marine-grade chromed brass. The MK11 has a balanced diaphragm to offer you peace of mind with its smooth breathing mechanisms and maximum performance that don't diminish as your tank's air pressure changes.

The The Mk11 First Stage Regulator comes standard with the Thermal Insulating System (TIS), which keeps your first stage from freezing up and malfunctioning in cold water conditions. Additionally, its over-balanced diaphragm first stage design gives you better breathing performance at greater depths. 

This First-Stage Regulator is equipped with two 7/16" threaded HP and four 3/8" threaded LP Ports. Two of the LP Ports are High Flow Ports (HFP) for easier breathing on demanding dives.

Diaphragm-based first stages are environmentally sealed so that water cannot enter the inner mechanism. Bearing in mind that regulators generate temperatures as low as 22F (-5.5C) due to the incredibly fast-moving air and the pressure drop involved, it is imperative that sensitive moving metal parts avoid contact with extremely cold water or debris.

The Mk11 First Stage Regulator Features:

• Balanced Diaphragm 1st Stage Design
• Chrome Plated Brass Body
• Multiple LP Ports, 2 HFP, 2 SFP w/3/8" Threads
• 2 HP Ports w/7/16" Threads
• Compact Streamline
• Environmentally Sealed
• Cold Water: Anti-Freeze Protection & Dry Chamber