Mr. Gasket Push-On Breathers has a beautiful chrome top and base finish which adds sparkle to the engine compartment. Mr. Gasket logo is embossed on top of these chrome breathers which gives them a classic look. They are internally baffled and use a high-porosity filter. These internal filters control oil and helps maintain the engine slot. These push on breathers are designed for high performance use. They fit both factory and after-market valve covers with 1.22" diameter hole.