406 washer and wiper questions

[David C]

Please can someone identify the Trico unit in my pictures? I have one fitted to the car above the screenwash bottle but not connected and no obvious loom for it to connect to. I assume it is original as I have another in my parts bin from long ago.

I sill have a vacuum operated windscreen washer unit installed. This has a vacuum pipe from the tank, a pipe to the washer jets and a smaller pipe to the back of the wiper switch. It would be good to know how pressing the wiper switch operates the vacuum wipers.

Also, any idea what the "Electric Coupler" shown on the Lucas wiring diagram does?

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