Vee Packing Set, 4.50 Inch OD, 4.00 Inch ID, 1.13 Inch Height

Yeah, the number of vees makes a real difference. Four vees gets you up to 3,000 PSI, five vees bumps that to 5,000, and if you go with six vees you're looking at a 10,000 PSI ceiling. The set itself runs a 4.00 inch ID and 4.50 inch OD, so as long as those dimensions match your bore and rod, you just pick the vee count based on what your system's pushing.

For this vee packing set, the key fit numbers are the 4.00 inch ID and 4.50 inch OD. The ID is the inside diameter of the packing stack and the OD is the outside diameter once it is assembled.

The pressure rating depends on how many vees you stack in the set. You're looking at anywhere from 0 to 3000 PSI with four vees, up to 0 to 5000 PSI with five vees, and even 0 to 10,000 PSI if you go with six.