This play one words is actually very devious. This module actually has the Vac-U-Lock attachment on the other side, so hood up your favourite deepthroater and slowly screw, no escape for you sub! 
 
Pure evil!
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Dildos sold separately - designed for the 8" Dong sold by F-machine 
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Gas mask not include, dildo not included and requires an S10/FM12 insert to be attached to mask