As with any rubber hose below waterline, the PSS bellows must be inspected on a regular basis for any sign of wear, aging or chemical deterioration. PYI suggests preventative maintenance. Deep Blue carries the PYI Shaft Seal Maintenance Kit 07-078-214-R. The PYI Shaft Seal Maintenance Kit 07-078-214-R comes with one PSS bellow, two o-rings, five set screws, four new hose clamps and an allen key. The PYI PSS dripless Shaft Seal Maintenance Kit 07-078-214-R measures as follows: Shaft Size: 7/8 inch, Stern Tube O.D.: 2-1/4 inch thru 2-3/8 inch.