Through Hull Fittings
A standard boat has the following submerged through-hull fittings:
- Fore toilet inlet
- Fore toilet outlet
- Fore toilet wash basin outlet
- Sink outlet
- Engine salt water intake
- Aft toilet intake
- Aft toilet outlet
- Aft wash basin outlet
Through hull fittings of the options:
- Salt water system inlet
- Septic tank outlet
The following through hull fittings, which are above the waterline, do not have a seacock:
- Automatic bilge pump
- Manual bilge pump
- Sea cooling water anti-siphoning vent
- Webasto air heater (rubber plug)
Note:
Make sure that you know all the through hull fittings and seacocks of your NC. If there is a leak somewhere, it can usually be temporarily shut by closing the seacocks. All submerged through-hull fittings are equipped with brass seacocks, which can be shut when necessary (see drawing).
IMPORTANT
When cruising under sail, always keep the outlet seacocks of the toilet wash basins and the galley sink shut, in order to prevent seawater from entering into the boat when it heels. During strong heeling, the sink, etc., will be under the waterline.
| Number | Position | Name | In Use? | Purpose | Nut width | Casing Width | Hose Outter Diameter | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Salon floor walkway | Fore head holding tank exit | Yes | Allows holding tank to be empited overboard | 1.5 inches | 4 iches | 1 inch | ||||||||||||||||
| 2 | Salon floor walkway | Salt Water Rinse | No | For rinsing off anchor | none | 1 1/4 invh | 3/4 inch | ||||||||||||||||
| 3 | Salon floor walkway | Fore head raw water in | Yes | For bringing in raw water for forward head | 1 1/4 inch | 4 inches | 1 inch | ||||||||||||||||
| 4 | Salon floor walkway | Head sink exit | Yes | Drains head sink overbaord | 1 1/2 inch | 4 1/5 | 1 1/2 inch | ||||||||||||||||
| 5 | Salon floor walkway | Galley sink exit | Yes | Drains galley sink overboard | 1 1/2 inch | 4 1/2 | 1 1/2 inch | ||||||||||||||||
| 6 | Salon floor walkway | Fore head toliet direct exit | Yes | Allows fore head to be emptied overboard | 2 1/4 inch | 6 1/5 | 4 1/2 inch | ||||||||||||||||
| 7 | Under port side lazerat | Air Con 1 | Yes | Gives raw water cooling to AC 1 | 1 1/4 | 1 1/2 | 1 1/4 | ||||||||||||||||
| 8 | Under port side lazerat | Air Con 2 | Yes | Gives raw water cooling to AC 2 | 1 1/4 | 1 1/2 | 1 | ||||||||||||||||
| 9 | Starboard side engine room | Engine Raw Water | Yes | Raw water cooling for engine | 1 1/2 inch | 2 inch | 1 1/4 inch | ||||||||||||||||
| 10 | Starboard side engine room | Generator Raw Water | Yes | Raw water cooling for engine | 1 1/2 inch | 2 inch | 1 1/4 inch | ||||||||||||||||
| 11 | Aft shaft compartment | Aft blackwater pumpout | No | Pumps out blackwater from bad tank | 2 1/4 inch | 2 3/4 inch | 1 3/4 inch | ||||||||||||||||
| 12 | Aft shaft compartment | Raw water in for aft toliet | Yes | Allows water to fill aft toliet bowl | 1 1/4 | 1 3/4 | 1 inch | ||||||||||||||||
| 13 | Aft shaft compartment | Aft head sink drain | Yes | Allows sink to empty overboard | 1 3/4 inch | 1 7/8 inch | 1 1/2 inchl | ||||||||||||||||
| 14 | Aft shaft compartment | Aft head toliet direct overboard | Yes | Allows head to empty directly overboard | 2 1/4 inch | 2 3/4 inch | 1 3/4 inch |