# OD size of the tube shaft thruhull in the engine compartment Nonsuch 30? **URL:** \ **Category:** Newsgroups Archive Prior to 2025\ **Created:** [June 24, 2024, 8:12pm UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489 "2024-06-24T20:12:57Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Bill\_Cunningham](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@Bill\_Cunningham](https://nonsuch.discourse.group/u/Bill_Cunningham)\ **Post date:** [June 24, 2024, 8:12pm UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/1 "2024-06-24T20:12:57Z")
I’m away from the boat and can’t get a measurement right now to fit a new stuffing box. Anyone happen to know the OD of the shaft thruhull tube so I can find the right diameter stuffing box tube? Thanks… ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/1X/39e3f8ffb93f4278d654ae38d831066e407d616b.jpeg) [@system](https://nonsuch.discourse.group/u/system)\ **Post date:** [June 24, 2024, 8:32pm UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/2 "2024-06-24T20:32:15Z")
It should be listed in the owner’s manual. Joe Valinoti S/V iL Gatto NS30U #221 Sea Harbour YC Oriental, NC USA ```auto ``` ---
**Author:** ![Bill\_Cunningham](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@Bill\_Cunningham](https://nonsuch.discourse.group/u/Bill_Cunningham)\ **Post date:** [June 24, 2024, 8:54pm UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/3 "2024-06-24T20:54:18Z")
Joe, Thanks for answering… You’re correct as I found this in the online manual for a 1981 Nonsuch 30 Classic before posting. My manual is on board my boat and is for a 1986 Ultra. There may be an updated version but this is all I could find or I missed something else in the manual. ![Screenshot 2024-06-24 at 3.43.04 PM.png](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/2X/c/cdb196862102463359c6264af67f6295a35cb9e4.jpeg) My Volvo Penta which fit on my boat was a 25mm Shaft going to a 45mm thru FRP hull connection (about 1.65 inches). This shows a 2" hose connected between the FRP and the stuffing box but doesn’t give the dimension of the FRP thru Tube molded into the hull. It’s the FRP thru Tube that is in question. ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/1X/39e3f8ffb93f4278d654ae38d831066e407d616b.jpeg) [@system](https://nonsuch.discourse.group/u/system)\ **Post date:** [June 24, 2024, 8:54pm UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/4 "2024-06-24T20:54:37Z")
The 25th page of the online version of the manual says to use a 2" neoprene hose to connect the stern tube and stuffing box. – Bob Me Gusta Nonsuch e26U #233 Looking forward to seeing folks in Toronto: [https://nonsuch.org/2024-INA-International-Rendezvous-Status](https://nonsuch.org/2024-INA-International-Rendezvous-Status) ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/1X/39e3f8ffb93f4278d654ae38d831066e407d616b.jpeg) [@system](https://nonsuch.discourse.group/u/system)\ **Post date:** [June 24, 2024, 9:09pm UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/5 "2024-06-24T21:09:53Z")
Posted the previous before seeing your clarification, Bill. It saves everyone time if questions include boat info and location. All the boats’ manuals, including both the N30 Classic and the N30 Ultra, are on-line under MEMBERS - MANUALS at [www.Nonsuch.org](http://www.Nonsuch.org). Folks might want to download a copy of theirs – it’s a useful backup for situations when one can’t get to the boat. The N30 Ultra manual has the drawing on its page 38. It calls for a 1.75" neoprene hose. For both boats, I’d think it’s safe to assume that the stuffing box and shaft logs have identical diameters since the hose diameter’s the same at both ends. – Bob Me Gusta Nonsuch e26U #233 Looking forward to seeing folks in Toronto: [https://nonsuch.org/2024-INA-International-Rendezvous-Status](https://nonsuch.org/2024-INA-International-Rendezvous-Status) > **(attachments)** > > [nonsuch ultra 30 volume 2, p38.pdf](https://nonsuch.discourse.group/uploads/short-url/wS42OUjXjrygskHw1VmdO2kD9eS.pdf) (766 KB) ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/1X/39e3f8ffb93f4278d654ae38d831066e407d616b.jpeg) [@system](https://nonsuch.discourse.group/u/system)\ **Post date:** [June 25, 2024, 12:45am UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/6 "2024-06-25T00:45:18Z")
I believe that the OD of the tube is 2” as described which would use a 2” hose. Joe Valinoti S/V iL Gatto NS30U #221 Sea Harbour YC Oriental, NC USA ```auto [details="(attachments)"] ![Screenshot 2024-06-24 at 3.43.04 PM.jpg|879x673](upload://tlEmrjefGn7Mz72PBM8cjTqUU5e.jpeg) [/details] ``` ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/1X/39e3f8ffb93f4278d654ae38d831066e407d616b.jpeg) [@system](https://nonsuch.discourse.group/u/system)\ **Post date:** [June 25, 2024, 6:00am UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/7 "2024-06-25T06:00:47Z")
I recently had my PSS shaft seal serviced. The service kit I used was for a 1.75" tube, with a 1" shaft, on my 1987 30 Ultra. Don > **(attachments)** > > ![Screenshot 2024-06-24 at 3.43.04 PM.jpg](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/2X/c/cdb196862102463359c6264af67f6295a35cb9e4.jpeg) > ![Screenshot 2024-06-24 at 3.43.04 PM.jpg](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/2X/c/cdb196862102463359c6264af67f6295a35cb9e4.jpeg) ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/1X/39e3f8ffb93f4278d654ae38d831066e407d616b.jpeg) [@system](https://nonsuch.discourse.group/u/system)\ **Post date:** [June 25, 2024, 1:12pm UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/8 "2024-06-25T13:12:45Z")
I replaced my hose last year with a 1-3/4" hose from Hamilton Marine. Here’s a link [https://shop.hamiltonmarine.com/products/buck-algonquin--hose-for-packing-boxes-heavy-duty-43012.html](https://shop.hamiltonmarine.com/products/buck-algonquin--hose-for-packing-boxes-heavy-duty-43012.html) to there listing which says use the 1-3/4" hose for a 1" shaft.. My shaft is 1" diameter. Bill Mortensen NS 30U #335 Summer Song, Noank, CT ---
**Author:** ![Bill\_Cunningham](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@Bill\_Cunningham](https://nonsuch.discourse.group/u/Bill_Cunningham)\ **Post date:** [June 27, 2024, 12:21pm UTC](https://nonsuch.discourse.group/t/od-size-of-the-tube-shaft-thruhull-in-the-engine-compartment-nonsuch-30/9489/9 "2024-06-27T12:21:30Z")
Thanks all for your help and suggestions. I found a second stuffing box diagram specifically for the 30 Ultra. It’s not dated BUT does show that the Ultra does use a 1-3/4" hose. Since I’m #358 and Summer Song is #335, I’m confident that the hose size was reduced from 2" in 1981. Attached is the page from the 30-U manual. Should get my new stuffing box today (a buck-algonquin)!!! > **(attachments)** > > ![nonsuch ultra manualStuffingBox.jpg](https://canada1.discourse-cdn.com/flex011/uploads/n26_115_233/original/2X/6/65e9e9434c3971ad1b60c22636bc5c408deaa780.jpeg)