USE AS REPLACEMENT FOR CLAMSHELL MANIFOLDS TUBE IN TUBE KIT CONTAINS BOTH MANIFOLDS, GASKETS, FITTINGS, HOSES, CLAMPS, AND HARDWARE USED ON "L" SERIES ENGINES WITH CATALYZED EXHUASTGenuine Indmar Parts deliver optimal performance, efficiency and a longer engine life.PRECISION FIT. GENUINE QUALITY.PROVEN PERFORMANCE.