Vee Packing Set, 4.25 Inch OD, 3.75 Inch ID, 1.00 Inch Height

It depends on how many vee rings you stack in there. Four of 'em will handle up to 3,000 PSI, five will get you to 5,000 PSI, and if you use six, you're good for up to 10,000 PSI.

Fit is based on the set dimensions. This one is 3.75 inch ID, 4.25 inch OD, and 1.00 inch tall, so it matches those measurements if that is what your gland is set up for.

Five vees gets you up to 5,000 PSI with this set. The ordering code breaks down into four positions: the first number tells you how many top nylon adaptors are included (almost always 1), the second is the quantity of urethane vee rings, the third is fabric vee rings, and the fourth is the bottom nylon adaptor count (also usually 1). So if you're building a five-vee stack, your code would reflect one top adaptor, your split of urethane and fabric rings adding up to five total, and one bottom adaptor. Count the vee rings in the code and match that to your pressure requirement before you finalize the order.