They're larger than a quarter but these are the original cockpits lights on my 97 2320.
https://www.perko.com/catalog/lighting_fixtures/87/reduced_glare_design_cockpit_light/
$75 SHIPPED
Brand New But Not In Packaging
Includes Light w/ (3) Batteries, Whistle & Daytime Flag
Replaces USCG Flare Requirements
C-1003 eVDSD SOS Electronic Distress Light for Boats
I originally posted about these about a year ago:
https://www.classicparker.com/threads/perko-transom-bronze-thru-hull-scuppers.21128/
And was just able to find a source for these where I didn't need to buy 10. Perfect to replace the plastic transom thru hulls on our Parkers.
Just getting an...
Most of the locking caps I've seen come as a whole assembly.
You can try something like this that prevents siphoning from the fill:
http://www.vetusmarine.com/store/p/387-Fuel-Theft-Security-Device.aspx
I've used Teflon paste sealant on the plugs for years & never had a problem with leaks or removal.
https://www.homedepot.com/p/Hercules-Real-Tuff-4-oz-Pipe-Thread-Sealant-156152/203304169
Interesting that a 25' would be considered over the 5 NT. I just did a search through the USCG PSIX and found more than a few 25' Parkers that are indeed documented. Its looks like most of them use 4.5' for the depth measurement so if go by that measurement it would be around 7+ GT so I guess...
Brackets don't count, the pilothouse doesn't count, anything in the hull such as fuel or water tanks would subtract from the volume.
Search for USCG form CG-5397. Truthfully save yourself the trouble as any boat under approx 27 ft will not be 5 NT
Tonnage as related to documentation has nothing to do with the weight of the boat. Its the volume in area the vessel can hold.
There is a formula the USCG goes by. Basically its Length x Beam x Depth (Rub Rail To Bottom Of Hull) x .67 For Powerboats