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 07-134-312-R. The PYI Shaft Seal Maintenance Kit 07-134-312-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 07-134-312-R measures as follows: Shaft Size: 1-3/4 inch, Stern Tube O.D.: 3-1/2 inch thru 3-5/8 inch.