Nylon fitting suitablility and permeation

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Jun 8, 2004
1
- - Fat Cat
Hi Peggy,

I am in the process of installing a new head and replacing all my sanitation hoses with Trident 101/102.

I have a question about the nylon fittings prevalently used to make connections to holding tanks and macerators.

Several people have advised me that nylon is hygroscopic, will absorb water over time, and eventually become odorous. They suggest that these nylon fittings need to be replaced with PVC equivalents, which aren't hygroscopic, to eliminate foul odors.

The problem is that I cannot find equivalent fittings in PVC, especially the Tee used to connect a macerator (1 1/2" FPT). The Marine Sanitation Manufacturers, and Vendors only offer this Tee in Nylon along with the majority of their fittings. Catalina Yachts installed Nylon fittings when the boat was built at the factory. Trident offers Nylon fittings.

What am I missing... If nylon has permeability issues and will eventually smell, why is it so prevalent, and the standard in the industry?
 
Dec 2, 1997
8,950
- - LIttle Rock
Nothing wrong with nylon fittings IMO...

Except for thru-hulls, that is...'cuz nylong isn't UV resistant.

But if you want PVC, it's available all over the place...in most boat stores, plumbing supply stores, hardward stores. If you absolutely insist on paying a premium for a "marine" label on 'em, SeaLand/Dometic has every 1.5" you could want...see 'em all here: http://www.sealandtechnology.com/productpages.asp?pid=66 Scroll to the bottom of the page to see the drawings.
 
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