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Offshore Cruising. Preparing Craft and Crew – A Special Tip – Thru-Hulls


Boaters University Tips

You can sign up for Jeff’s Offshore Cruising course by going to

This Offshore Cruising Tip is called, “Through hulls”.

Through hulls are vital operational features that every boat owner needs to understand.

Many owners take through hulls for granted and don’t give them much thought. We’d like to encourage you to remember their vital roles.

We recommend that you identify the location and purpose of each through hull on your boat. As part of your check lists and routines we suggest you test regularly and make sure each through hull is working – it can be freely opened and closed. When they aren’t used, they can “freeze” or become stubborn.

Through hulls that supply raw water to strainers seem to get more service since they are closed off to clean out the strainers, then re-opened.

Other through hulls, like deck drains, are rarely adjusted since they are almost always left open.

“Exercising” through hulls keeps them active and ready.

One tip we recommend is using a PVC pipe as a “long reach” to check those through hulls tucked away outboard and also as a “persuader” that can give you the extra leverage you need to nudge a through hull that has become stiff due to lack of use.

Never force a through hull, you could break it and open the flow of water. It is a good practice to have soft wooden bungs and a soft blow hammer nearby to plug a broken through hull and stop the inflow of raw water.

If your boat is hauled out you can be a bit more aggressive, but if they are really stuck, they may need to be disassembled or replaced.

To learn more about preparing for safe cruising, we invite you to sign up for “Offshore Cruising – Preparing Craft and Crew” and learn why it has become one of the most popular classes offered.

To log in and sign up for the course, please go to this link,

JMYS clients can insert the discount code JEFFSAVES at check out to receive a 20% discount.

JMYS is proud to partner with Boaters University and we hope that you will sign up to take the course. We truly believe this course will be a huge help for all boaters who wish to travel offshore.

Thank you for watching this special tip video, we welcome your comments.

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Jeff Merrill Yacht Sales, Inc.