Hey Jay Brown, Welcome!! That "filter" behind your seat would be the breather for your hydro-vac. If you step on the brake,and hear a "huffing" noise for a second,it's the hydro-vac,taking air in through the filter.


Just sold: 1955 2nd Series 6500 2-Ton Flatbed Truck
Mo' Tater
In the Stovebolt Gallery
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It takes an awful big dog to weigh a ton.