Clamp On Breather - Fits 1in ID Tubes

The Clamp On Breather from Moroso is an essential crankcase ventilation component designed to manage internal engine pressure and prevent buildup of harmful vapors in your engine bay. Whether you're running a naturally aspirated engine, forced induction system, or custom stroker, proper breather design directly impacts ring seal integrity and engine longevity. This clamp-on style breather fits 1-inch ID tubes, making it a versatile choice for builders integrating aftermarket intake manifolds, custom headers, or modular PCV systems without requiring permanent modifications to factory engine blocks or cylinder heads.

Engineered by Moroso—a trusted name in engine technology and performance cooling—this breather utilizes a simple yet effective clamp-based attachment mechanism that secures tightly to any 1-inch diameter hose or tube without thread engagement or welding. The design eliminates oil carryover into intake systems while allowing pressurized gases to escape safely, maintaining optimal air-fuel ratios and preventing vacuum leaks that plague poorly ventilated engines. Its compact footprint (3.3 x 2.4 x 3.85 inches) and lightweight construction (0.19 lbs) make installation straightforward in tight engine compartments, and the universal fitment accommodates both street and race applications across a wide range of engine platforms and configurations.

This breather is ideal for engine builders, performance enthusiasts, and mechanics working on high-output engines, LS-based conversions, small-block or big-block builds, or any custom application where factory PCV routing is impractical or compromised. Installation is quick: simply clamp the breather onto your existing 1-inch tube using the integrated clamp mechanism, orient it to suit your plumbing layout, and secure tightly. Pair it with matching 1-inch ID hoses and quality PCV valves for a complete, efficient crankcase management system that protects ring seal longevity and maintains engine cleanliness on both street and track vehicles.