Allegro 9510-50 MVP Confined Space Manhole Ventilation Passthru SR2K resists tendency to back-out of

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it extends around the entire circumference of the hard hat

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The versatility is simple - because of its smart sensor technology

Allegro 9510-50 MVP Confined Space Manhole Ventilation Passthru SR2K resists tendency to back-out ofAllegro's new 9510 50 Manhole Ventilation Passthru is a really cool piece of equipment. It is a incredibly simple way to ventilate a space while at the same time still allowing access to the space for your workers. It is an excellent and less expensive alternative to the Saddle Vent system. Allegro's Manhole Ventilation Passthru (MVP) is made with a low profile air vent for the manhole itself, a 90 elbow, and built in mounting. The length from the top