Stuffing box seals are the most common type of pump rotor seals because they are adjustable and periodically restorable assemblies during operation. Based on the study of physical processes. a sealing mechanism model of the stuffing box seal is formed as a combination of two successive hydraulic resistances: a pre-switch resistance. which is similar to a slotted choke. https://www.bekindtopets.com/deal-alert-NHL-Winnipeg-Jets-Distressed-iPhone-13-Pro-Max-MagSafe-Case-p96268-great-save/