Proflow Crankcase Exhaust Evacuation System, Vac-U-Pan, Universal Kit - PFE-R2050Part Number: PFE R2050 Proflow crankcase evacuation systems reduce crankcase pressure for fewer oil leaks and an optimum piston ring seal, resulting in a better performing engine. Each system includes two chrome plated push in breathers, check valves, weld in 3. 5" long threaded pipe adapters, rubber breather grommets, and four hose clamps.