Anyone going to the trouble (more trouble for some than others) of replacing sanitation hose should give serious consideration to replacing with Raritan Sani-Flex (
https://www.raritaneng.com/en_US/products/saniflex). It’s the only product recommended by Peggy Hall, the famous “Head Mistress” who “wrote the book” on boat sanitation,
The New How to Get Rid of Boat Odors. It has a 10 year warranty and generally outlives that by a lot. Its other great virtue is that it is highly flexible. Much easier to install because of that, and also much easier to route so that you ensure that there are no low spots where the icky stuff will collect and sit. Both Peggy Hall and many others on the Trawler Forum think it’s far and away the best product available.
Much more expensive than the low end stuff, but really, you don’t want to do this job more than once or at most twice, right? Usually available through Fisheries and Defender, with the best price at Defender (depending on what shipping adds).
Gini