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Hose in the pic is not a recommended - Hump Hose (you can find one on Catalina direct)
I would not conciser replacing it a very difficult job but you will be working in very limited space.

You might want to inspect your exhaust riser while you are on the topic.

No "bump" - nice,  and there are only 6 boats between us... 

Someone was definitely "creative" with these valves. 
I like the green one.

I'm not sure if it is officially supported configuration but answer is:  Yes.
You can leave the Forespar thruhull only swap the nut from forespar to trudesign (allowing load bearing collar to fit nicely)    -  Most likely exact setup I'm going to use.
Will post some pics once I get to the boat.

I'm referring to the inside bump getting in the way of easily adding a mounting plate.
Almost all thruhulls (or actually surrounding areas) in my boat look like this and it appears to be sock factory no PO mod traces of any kind.

I'm partial to "trudesign" collar that would simply go around the bump providing good lateral support and no need for very custom backing plates
Unless someone can suggest better method.

John W - CD does sells both types
When you were installing backing plates was your hull relatively flat or did you have to deal with a bump like I have  ?

I'm planning to use trudesign seacock with existing or new forespar thruhull to avoid any modification of the hull
I already have one dry fitted and it looked and felt solid.
Will report more once it stops snowing and temp gets north of 32 

- no leaks
- no clear issues other then age / unknown deterioration of the material

"If its not broken, leave it alone."

point taken

I have always kept a set of wood plugs on my boats -   your  "TruPlug" suggestion looks superior. I'm definitely getting these on board.

Mine appear to be original as well, that makes them 23 ....

I must be mildly dyslexic when trying to close them. 

You are not alone in my short experience with forespar I had same issue - On the other hand trudesign handle is not symmetric and easy to identify turn direction

I have already made a decision on replacing seacocks  ,  still unsure about thruhulls. Can't find any information on how these age to push me over the edge.

Some say "When in doubt , rip it out" 

Unfortunately above problem is very different (direction and signal type )  then connecting AIS to Garmin over NMEA 0183 (simple connectivity and supported signal/sentence). 

Issue is with Garmin specifically 741XS GPSMap not forwarding wind sentences on NMEA 0183 protocol  . (  as per manual it is an expected behavior)

It is possible that Garmin could add such functionality in the future via firmware update, but I would not hold my breath

Only way to resolve it is to find something that can translate NMEA 2000 wind info to NMEA 0183 format 
(suggested Actisense NMEA 2000 to NMEA 0183 Gateway  -  is a solid product)

Since your Autopilot  "SeaTalk"s  other option is to use :

Raymarine SeaTalk1 to SeaTalk ng converter
and
SeaTalk Ng  to NMEA2000 adapter

It is less elegant but it would probably be also less expensive

I have no real experience with reliability of such solution.

Digital Yacht will have some type of SeaTalk <-> NMEA2000  product released this spring , but details and price are not known.

Looks like  Garmin 741XS GPSMap is not able to transmit MWD and MWV over the NMEA 0183 see page 39 of the manual
You might have to get something like Actisense NMEA 2000 to NMEA 0183 Gateway.

I don't think we have enough information here
Can you draw or describe your setup  ?
What network / instruments do you have ?
In general connecting  NMEA 2000 to NMEA 0183 is not trivial will require some translating device and planning

My 1.5 manual is listing following :

I actually tested all 3 in the area and you can't really go wrong with either one - however it all depends what is important to you.

    2 boats make a fleet right ?
Stop by at  Worton Creek