Return of the what are these do-dads?

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
24,519
CAL 35 Cruiser #21 moored EVERETT WA
They are water proof caps to seal something. Maybe a radio fitting either antenna or mike. Or an electrical connection like wires going into the deck near the mast.
 
Dec 4, 2017
79
Hunter 466 Seattle
They are threaded to fit together, with both male and female parts. Maybe garden hose fittings? If there was a hole in either part, I'd call it a weld-in bung.
 
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Oct 29, 2005
2,366
Hunter Marine 326 303 Singapore
For keeping your contact lens? The o-rings makes it water tight.
 
Oct 19, 2017
8,119
O'Day Mariner 19 3444 Littleton, NH
Pill box. Put your nitro pills in them and screw the male and female together and you'll never get them wet while changing the headsail to a storm jib.
Or, you can cap off a sink faucet that is below the waterline when going away for the season.
- Will (Dragonfly)
 
Jul 12, 2011
1,165
Leopard 40 Jupiter, Florida
If you have my luck, they are spare parts for a piece of obsolete equipment the PO replaced five years before you bought the boat! But ... I guarantee that two weeks after you through these in the trash, you will find they are indispensable for storing some piece of equipment that you currently own. Your choice on bad luck.
 
Dec 23, 2016
191
Catalina 27 Clinton CT
They are most certainly thing-a ming jings that attach to the doohickey to facilitate the raising of the Whomper ( but keep this top secret, no reason to let the other boats know what you are up to)
 
Jan 22, 2008
8,050
Beneteau 323 Annapolis MD
One looks like the cap to a canteen. But with the two, they look like a pill container- like to keep the Vaigra in..
 
Aug 22, 2011
1,113
MacGregor Venture V224 Cheeseland
All I know for sure is that a week after you toss them the need for them will suddenly arise...
 
Oct 19, 2017
8,119
O'Day Mariner 19 3444 Littleton, NH

Try searching hose or faucet caps.
This might be a job for the Headmistress.

- Will (Dragonfly)
 
Jun 23, 2013
271
Beneteau 373 Newport
Think about something liquid that is disconnected and both sides need to be capped. Size would help to determine possible
 

Apex

.
Jun 19, 2013
1,222
C&C 30 Elk Rapids
Looks to me like a VHF through fitting cap: see here
Male cap would cover female side, female/male. And looks like two sets in the picture.
 
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Likes: Will Gilmore
Mar 29, 2015
69
MacGregor 25 trailer sailer
The one in the link from apex is EXACTLY what I cap mine with when the mast is down. Thats what I was thinking the op's picture was, I was going to attatch a picture of mine, but that its the same.