stupid thru-hull measurement question - SailNet Community

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
Old 03-20-2009
Junior Member
Join Date: Mar 2009
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
squishface is on a distinguished road
stupid thru-hull measurement question

I'm shopping for a replacement thru-hull and seacock, but I'm confused about how they are labeled. The hole is about 1/2 inch diameter, its 3/4 inch if I measure the width including the threads. Do I buy a 1/2 inch or 3/4 thru-hull?

(I remember reading somewhere that you measure the hole, but the site says "thread size", so I'd think you measure the whole thing, hence my confusion)

Last edited by squishface; 03-20-2009 at 12:26 PM.
Reply With Quote Share with Facebook
Old 03-20-2009
Senior Member
Join Date: Apr 2008
Posts: 476
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
negrini is on a distinguished road
Send a message via AIM to negrini Send a message via Yahoo to negrini Send a message via Skype™ to negrini
Usually their label refers to the hose/pipe conection size. A 1/2 inch thru-hull will need a little more than that when cutting the hole on hull. There are some bulky ones that require a bit larger hole. You probably have a 1/2 inch one, but best way is to measure it.
Nave Rara
Beneteau Oceanis 43
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
Old 03-20-2009
rikhall's Avatar
old guy :)
Join Date: Feb 2008
Location: Fredericton, NB, Canada
Posts: 1,029
Thanks: 12
Thanked 13 Times in 11 Posts
Rep Power: 7
rikhall will become famous soon enough
I have made the same mistake. My suggestion:

If possible (not always possible) take the old one out and take it to you favorite chandelier. Then you can compare side by side.

A good and worth while project.


Irwin Citation 34
Reply With Quote Share with Facebook
Old 03-20-2009
Senior Member
Join Date: Aug 2007
Posts: 212
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
7Psych is on a distinguished road
What's the size of the hose? That usually helps if it's a 1/2" hose through hull fitting, the hole would be the size of the outside measurement...which could be 3/4" overall.
Reply With Quote Share with Facebook
Old 03-20-2009
Sea Slacker
Join Date: Jan 2007
Posts: 1,789
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
brak is on a distinguished road
thru hulls and other fittings are measured according to "nominal pipe size". this is more or less an inside diameter of the fitting. I.e. the hole in your thru-hull will be about 1/2" in diameter if it is labeled as a '1/2" thruhull'. Outside diameter of all fixtures will vary of course (what's an outside diameter of a seacock anyway? ). For thruhulls outside diameter is about 1/4-1/2" more depending on size.
Reply With Quote Share with Facebook

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Similar Threads
Thread Thread Starter Forum Replies Last Post
C & C 121 Customer Response to Manufacturers Post camaraderie Tartan 2 09-12-2012 03:54 PM
In the category of the only stupid question is one not asked? mikeedmo Gear & Maintenance 7 03-30-2007 07:53 AM
Stupid Question #276 thegolux General Discussion (sailing related) 7 02-22-2007 06:37 PM
Thru Hull Replacement Stormer Gear & Maintenance 4 08-03-2004 08:21 AM
Stupid engine question sneuman Gear & Maintenance 8 04-24-2003 04:25 PM

All times are GMT -4. The time now is 05:10 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) LLC 2000-2012

The store is owned and operated by a company independent of the forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.