Manhole Ventilation Passthru Showing all 2 results Default sorting Sort by popularity Sort by latest Sort by price: low to high Sort by price: high to low Sale! Allegro 9510-50 8″ Manhole Ventilation Passthru | Yellow $318.97 Original price was: $318.97.$95.69Current price is: $95.69. Add to cart Sale! Allegro 9510-50EX 8″ Explosion-Proof Manhole Ventilation Passthru | Black $639.42 Original price was: $639.42.$191.83Current price is: $191.83. Add to cart