Can anyone identify the size of this thru hull?

[kalanka]

I want to replace the thru hull fitting and strainer on a 1988 Sadler 34. The strainer is a Guidi Terrreno which sells in sizes (BSP?) from 3/8 to 3/4 inch.

It is very hard to access the location to measure but I would like to source the right size of thru hull and strainer. Boat is currently afloat but will be dried out pre-season

Can anyone make an informed guess as to the sizes shown in these photos?

Thanks

 

[vyv_cox]

Where is the fitting? On my 34 all seacocks are 3/4 inch except the toilet discharge, 1.5 inch. The original Bukh 20 used a 1/2 inch coolant seacock but I changed that for 3/4 inch when I replaced it with a Yanmar.

 

[kalanka]

Hi Vyv,

On the starboard side of the engine just aft of the gearbox/propshaft coupling. It is a Volvo 2003 engine with freshwater cooling.

Thanks

Bob

 

[kalanka]

I think it is the original fitting...

 

[VicS]

measure the OD of the threaded section with calipers. No need for digital vernier type . These'll do. The outlet hose tail should be the same size and may be more accessible.

...........................subtract ¼" and you will be close to the BSP size. Alternatively look it up in Zeus https://www.moonshiners.org.uk/MZ/zeus.pdf



or on line thread tables

or here

 

[Tranona]

The 2003 requires a 3/4" intake

 

[JOHNPEET]

British Standard Pipe threads relate to the bore size of the pipe that is threaded.

 

[kalanka]

Very helpful. Thanks!