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Lizzy Belle · 15-03-2016, 15:41

No clue what it is, but maybe you can use it to brew your own beer?

New-to-you boat -congrats!- but didn't you check things and do a 'walk through' with the previous owner? If he's still around somewhere, maybe you can contact him.

Sailor Doug · 15-03-2016, 19:00

Looks like accumulator. Cylinder with a piston with compressed gas or spring on one side and water on the other. They can quickly destroy on demand water pumps. Also used in hot water heating systems to tack-up thermal expansion.

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Rex Delay · 15-03-2016, 19:55

Not connected to water system, do not have hydronic heating.

**atoll** · 15-03-2016, 20:43

Quote:

Originally Posted by Rex Delay

Crawled into cockpit locker to do a project and discovered this. I believe those are fuel lines going to it but did not have time to trace. Any ideas on what it is or does?

a nitrous oxide tank for when you need to make that quick getaway from the baddies

unclemack · 15-03-2016, 21:31

First thought was that it looks d.i.y or cottage industry standard.

Some people believe magnets can cure fuel problems but 2-3 litres seems big for something like that. Never seen one myself.

A small compass should tell you if there's a magnet inside though.

2-3 litres makes a header or accumulator tank more likely.

Header tanks tend to be mounted as high as possible .

Accumulators often have a Schrader (tyre) valve one end, easy enough to feel if there's one at the top.

Don't forget to let us know will you? Hate that

Sailor Doug · 16-03-2016, 06:17

Quote:

Originally Posted by Rex Delay

Not connected to water system, do not have hydronic heating.

May be disconnected after burning out on demand water pumps. Still looks like a accumulator.

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Scout 30 · 16-03-2016, 08:16

Does the hose coming out of the top go to a vent. If so it's a mechanism to keep fuel from flowing out of the vent if you overfill the fuel tank.

notiesbob · 16-03-2016, 08:21

You have C&C 41, that is oil reservoir tank for your hydraulic backstay, (maybe also for forestay, boom vang) there should be a black faced aluminum panel with control valve(s) and fitting for stainless steel pump handle in the cockpit and piston between transom chainplate and bottom of rod backstay. They were C&C option. The hydraulic system is self contained with no electricity. Basically a fancy hydraulic jack. That tank IS NOT a diesel fuel tank and it is definitely not a speaker. The wires are not related.

Is this a CF test? You have this boat in offshore sailing school in BC

seasick · 16-03-2016, 08:32

Out on a limb guess but I'm going with marine carbon canister to filter out fumes in the vent system of your fuel tank(s) May also prevent water intrusion into your tanks backing up through the vent.

msrcal36 · 16-03-2016, 09:06

Quote:

Originally Posted by Paul Annapolis

Rex Since you don't have the time to trace the lines which might take five or ten minutes and would likely answer your own question, why did you instead take the time to post the photos and pose the question--and why should we who are in the middle of all our spring boating projects worry our heads about your query?

Really? You've never had to hurry to leave the boat to get home?

unclemack · 16-03-2016, 09:16

Quote:

Originally Posted by notiesbob

You have C&C 41, that is oil reservoir tank for your hydraulic backstay, (maybe also for forestay, boom vang) there should be a black faced aluminum panel with control valve(s) and fitting for stainless steel pump handle in the cockpit and piston between transom chainplate and bottom of rod backstay. They were C&C option. The hydraulic system is self contained with no electricity. Basically a fancy hydraulic jack. That tank IS NOT a diesel fuel tank and it is definitely not a speaker. The wires are not related.

Is this a CF test? You have this boat in offshore sailing school in BC

All our brilliant guesses wasted, just wasted.

Rex Delay · 16-03-2016, 09:30

Just went down and had another look. The tank appears to have a vent on top, no air pressure valve anywhere. No moving or serviceable parts. Could not tell if magnetic (where did I leave that hand bearing compass?) The lines are fuel lines and headed toward the tank in the stern. Without someone else with me to extract me, could not crawl all the way back. I am still befuddled.