So your tractor holds 14 gallon, 1 2.5 gallon +1 1 gallon does a change for you?Holy s!*$$ batman I wish you hadn't said that.LOL Having said that you can get the same stuff on Amazon. I think it's right at $100 for a 2.5 gal pail and the filter is something like $38. My 3301 takes I think right at 14 gal so a 2.5 pail plus a 1 gal jug would do. I think the gallon jug was $58 so you might be better off buying 2, 2.5-gallon pails and have some for use later on.