It is a 4" coupler. However, I had a hard time finding a T-bolt that wasd just right - 3.75-4.25" (I think) was a tad too small; 4-4.?" was too big & would bottom out before sufficiently tight.
It is a 4" coupler. However, I had a hard time finding a T-bolt that wasd just right - 3.75-4.25" (I think) was a tad too small; 4-4.?" was too big & would bottom out before sufficiently tight.
yeh you need a clamp that fits real snug on the 4" coupler... this will allow it to get real tight without bottoming out. i have a few hundred in stock, along with all standard sizes from 2" - 4.25"