strain relief mechanisme/device
Explanation:
I have a gut feeling that the term you ask doesn't relate to the functionality of the suction unit as such, but, for example, to a power cord, a cable or a hose that requires some kind of protection against physical strain.
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Note added at 12 hrs (2009-06-11 08:50:35 GMT)
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Erratum: strain relief *mechanism*/device
|  Jack den Haan
Netherlands
Local time: 22:16
Native speaker of:  Dutch, English
PRO pts in category: 16
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The translation workplace 
peer agreement (net): +2
