Perko Gas Caps are a full line of EPA-compliant, replacement sealed caps with built-in vacuum over pressure relief (VOPR) to protect air quality from hydrocarbon emissions. Blue caps are for pre-2011 vented systems and green caps are for post-2011 sealed designs. Options include chrome-plated bronze, black or white polymer, and stainless steel models with the new international color-coded inserts. MSRP $30-$60; perko.com
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