Vac-u-lock

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Vac-u-lock
The Vac-u-lock system was developed by Doc Johnson as an easy way to be able to quickly change dildos on machines and strap-on harnesses. It consists of a textured plug that goes into a hole in the base of a dildo, being held in place with friction and the vacuum caused when air is displaced from within the hole.
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Synonyms: vaculock