Thru-Hull Lubricant

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Resources - Tech Tips
Marelon® - Marine Grade Plumbing Systems
Valve Lubrication:
As a follow up to previous Tech Tips; it is important to know that while Marelon®  fixings are corrosion resistant, they do require twice yearly
lubrication maintenance. These valves should be activated on a regular schedule. The handle should be moved throughout the open/close path every
thirty days. Leaving a valve open or closed without moving the handle can cause freeze-up. This is true of any valve, including bronze. The law of
nature is "use it or loose it".

To lubricate ball valves and seacocks while the boat is in the water you must:
Close valve.
Remove hose from tailpipe.
Remove remaining water from valve/tailpipe.
Swab waterproof grease (water pump grease, winch grease) or LanoCoteT,
generously, on ball.
Reattach hose, checking for fatigue and rusted hose clamps.
Activate valve a few times.

When boat is hauled, you can perform steps 4-6 from outside the hull to lubricate opposite side of ball and seals.

Forespar recommends "SUPERLUBE  TEFLON GEL".

As I understand, do not use any product containing Silicone either here or in any other seals like the head or pumps...  Silicone can cause some
seals to expand and make operation hard?