JWaldz
Moderator
I don't understand why they didn't incorporate an inspection window in the lid or sides. If I were you I'd get some plexi-glass and cut & drill to match the current lid. Either that or cut a square out of the lid or side of the box and either recess or surface mount an inspection window on it. If surface mounted I'd drill and mount bolts in the corners and seal all the edges. I dunno how easy those current bolts are to take in and out but just seems dumb you have to take it off every time to inspect the filter.