The PRV-I-2700-1SDBV4 is a single-stage, internal return pressure relief valve built for the most demanding LLY, LBZ, LMM, and 6.7 style diesel fuel systems pushing the absolute upper limits of common rail pressure at 2700 bar. The internal return design eliminates external return line modifications for a clean factory-style installation directly into the fuel rail. At 2700 bar this is the highest pressure rating in the DBV4 internal return lineup, making it the go-to choice for maximum effort competition builds, heavily modified CP3 setups, compound turbo Duramax and Cummins 6.7 platforms, and any build where fuel system limits are being pushed beyond what stock or mild performance valves can handle. If you are building for the top end, this is your valve.