Marelon vs Banjo brand fittings and valves?

Mar 20, 2012
3,983
Cal 34-III, MacGregor 25 Salem, Oregon
Marelon is a trademark name of glass reinforced polypropylene fittings....

Banjo is also a brand of glass reinforced polypropylene fittings.... but MUCH more affordable

what would be the difference in using them in a marine application, besides the name and the price?....

it is my opinion that the Banjo brand ball valves seem to be a much stronger valve and is about 1/5th price of the Marelon brand.

the Marelon brand is specifically targeted/branded for use in a marine/below the waterline enviroment, and the Banjo brand is built for heavy industrial use, which i suppose is why it is so much more robust in design.


I have been using the Banjo poly fittings for years on fuel and water truck plumbing, and didnt realize it was the same technology as the Marelon fittings.
 
Last edited:
Feb 6, 1998
11,701
Canadian Sailcraft 36T Casco Bay, ME
Marelon is really Dupont Zytel 70G13L. It is a reinforced variation of Dupont's nylon 66.. Compare the specs of 70G13L to the Banjo polypropylene valves...
 
Mar 20, 2012
3,983
Cal 34-III, MacGregor 25 Salem, Oregon
Marelon is really Dupont Zytel 70G13L. It is a reinforced variation of Dupont's nylon 66.. Compare the specs of 70G13L to the Banjo polypropylene valves...
between the two products, there is a lot of reading in all that.... marelon is actually nylon, and Banjo is polypropylene. both materials (synthetic polyamides) in these trade names are glass reinforced.

the uses for, and the properties of each run kind of parallel, with some deviations that would make one a better choice than the other for certain applications.
the polypropylene is moderately stronger and more versatile in most cases, but nylon has much greater elasticity, which can equate to strength in some applications.

the marelon product was invented before glass filled polypropylene, but the big difference is that the marelon has a melting point right at 500degrees, where as the polypropylene has a melting point around 340degrees...
I think this is why the Marelon product has a better rating for marine use.