EGR modulator TD5

Having a brain F**t. putting my new TD5 engine into my 110 and connecting up the bits and bobs. but Im stumped on the EGR modulator its that little thing on the drivers side bulkhead above the steering box.has a connection to the wiring loom a connection to the vacuum hose to brake servo pipe another to the EGR valve on the end of the plennum but there is another long rubber tube about 1m long with a couple of pipe clips. My instinct this just goes to the atmosphere but the RAVE manual and the Haynes manual just say it should be self evident what goes where just remember the order you took things apart, not very helpful. Any answers guys?

Depending on year, it is a vent to air filter or if before eu3 to atmosphere via a small filter, filter looks like an inline fuel filter.
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Thanks scooby thought as much but didnt trust my memory