Motorcycle Seal For Honda CRF450R CBR250R CRF250L CRF1100 2002-2020 Compatible with Honda CRF450R 2002-2020 CBR250R CBR250RA 2011-2013 CRF250L 2013-2019 CRF1100 2020 motorcycles with 45mm header port 45mm standard size manifold for direct installation without or adjustment temperature composite material blocks leakage under rev operation Compressible layered design fills uneven mating surfaces to keep airtight seal after thermal expansion contraction surface from moisture mud for offroad daily street riding