Thanks Daft and Dry_Sockets. Sorry I've been away from this a few days. I ordered this, suggested by dry sockets, but it won't get here for 6 weeks or more, coming from South Africa apparently.
https://www.amazon.com/ULKEME-Pressure- ... 3EQ2F7NXVW'
Ordered and received a different one from Senreal, but it does not fit. So this is what Daft was saying. Looks in the ballpark but does not work. Sending it back.
https://www.amazon.com/gp/product/B07CW ... UTF8&psc=1OK here's a question about the "heating up of the boat" on the water. This is a strange idea to me, because where I live anyway, the water temperature is low 70's at best. So since much of the boat is submerged in a high density, cool, highly conductive liquid, what makes people conclude that radiant heating from the sun is going to outway the cooling effects of the water??