Newly designed in 2012, our Balance Relief Valve is avcritical accessory for any drysuit diver, especially on long dives. Without a relief valve, divers tend to intentionally dehydrated themselves to avoid the "urge" during an extended bottom time dive. Hydration is critical to avoid decompression sickness and with our Balanced Relief Valve proper hydration is no longer a concern. Machined from Delrin, it is light weight so it will not add stress to drysuit material and it is corrosion resistant. The Relief Valve is equipped with a one-way valve so that the tubing is equalized with the air pressure inside the drysuit, which prevents the tubing from becoming crushed and stopping flow. Made in the U.S.A. Note: Installation requires a standard 5/8 inch punch, Dive Rite model no EX2786TOOL. We recommend installation by a professional drysuit repair center.