This is a stiffer and heavier grade of tubing for Commercial ZTM mowers. The extra stiffness prevents the tube from sagging when spanning the longer distance from the mower deck to the back of the larger commercial mowers. The heavier walls hold up better to daily commercial use. When purchasing a ZTM Deck Adapter Kit at the same time a credit of $50 is applied for the original tube making this a $50 upgrade.
We recommend calling us before ordering this item to confirm that you need it.