Hard to find RC marine Deck fill Adaptor

2019 Update

So, I replaced the pump put deck fill with a standard stainless steel unit and it turns out that the fitting has the SAME THREAD, which I now believe to be 1.25" NPS  (as in....  national pipe STRAIGHT)  The forespar part consists of a male to male 1 1/4" to 1 1/2" NPS reducer and a 1 1/2" female NPS to NPT adaptor.    Seems so simple now... 

See more recent  posts on replacing these deck fittings.

Original 2017 Blog post

It appears I am one of the fortunate few who has the threaded adaptor that actually fits the original 33-2 deck fill.   Finding a replacement is nearly impossible, apparently.   I finally got around to taking this thing to two hose and fitting supply companies in Toronto, and neither could identify it.   One tried hard and told me the thread diameter is 38.5 mm, 12 tpi, (yes, mixed the units) not tapered, and is not:
BSPP
MPSM
UNF

WTF?

The deck fills themselves look an awful lot like the forespar MF-830 series.

http://www.forespar.com/product602.html

UPDATE

OK, it looks like the 33-2 deck fills were made by a New Zealand-based company called RC marine, which was sold (along with Ronstan) to a corporation called Fortuna, which went bust mid 90's.  

The RC product line (and maybe others) was subsequently bought by Forespar in California, who continues to produce the same deck fills under the Forespar brand.  They are not widely distributed, and are difficult to find, and the connection to RC, surprisingly, is not readily findable on the internet.   In any case, the current Forespar Deck fills and associated spares are the compatible with our OEM RC deckfills.   (thanks Randy)

I have ordered a pump out adaptor.

Stay tuned.

UPDATE

May 6 2017

Got it.   Behold the elusive forespar MF-830, no doubt the prefix relates to its availability.

The pic is a bit dark...   As delivered the Forespar MF-830 adaptor consists of two pieces, screwed together.  It requires the addition of a cam lock hose connector to connect at the pump out.

What you get is a male to male adaptor, the small end of which (top thread in the photos) engages engages the deck fitting.  The large end (You can see a few threads)  engages  the second piece, which is a 1.5" female to female coupling.   

I wondered why the coupling was included - could the 1.5" male thread not fit a female cam lock hose connector?  Why three parts when two will do, as with my metal fitting in the photo above?

The 1.5" thread on both the coupling and the adaptor is not a standard north american tapered thread. (NPT style)   A cam lock hose fitting with a north american make thread will only fit if the tapered NPT male is threaded into the untapered female.  (like the metal example) The untapered male thread will not fit into NPT female thread. 

Anyway, it fits, it works, its available.   The readily available make plastic cam lock fittings thread perfectly into the coupling.  (the end facing down)  Nice thing is it is quite light.  I will attach a float, and the metal one will become a spare.

Fitting which fits.

Fitting which fits not.