The catch can has 19mm inlet and outlet fittings, so an oil/heat rated hose with 19mm ID will do but the inlet fitting on the engine near the turbo is around 22mm. I prefer to avoid the use of plastic reducers and elbows altogether, so I heat one end of the 19mm hose in boiling water and jam a socket into it while hot to enlarge the ID. Take the socket out when hose has cooled and you have a custom formed hose 19mm one end and 22mm the other. Mount the catch can on the side of the air filter box and rotate the top of the catch can so the inlet and outlet ports point towards the outlet and inlet ports on the engine and you avoid the need to use 90 degree elbows too.
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MY15 WK2 CRD Laredo
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