The aluminium housing is indeed empty, the plastic cap contains a diaphragm which in my car had aged over the previous 190k miles. I think the new cap/diaphragm was about £25 3 or 4 years ago when I replaced mine.
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Previously held: 264GLE;S60 SE 2.0T;XC70 SE LUX D5 (163);V70 SE (170);V70 SE D5 (163)
Currently held: XC90 SE LUX (MY12 200), XC70 SE D5 (MY06 185); V70 SE D5 (MY07 185)
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