PRESSUR COOK REGULATE3PC (Pack of 1)

This 3 piece regulator consists of a center bobber with two removable rings, for 5, 10, and 15 psi operation. My 16qt presto canner has a pressure gage also, so I started with just the center bobber and obtained barely rocking at 8psig, barely rocking again with center and one ring at 11 psig, and also barely rocking again with center and two rings at 15 psig. So you do have three options for pressure. I quickly replaced the 3 piece bobber with a one piece bobber and it barely rocked at 15 psi when the pressure re-stabalized. All this was on an electric stove. Hope this helps.... pmo