COPPER TUBING

(Page 2 of 2)

March/April 1981
Bud Motry 
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COMPRESSION FITTING

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A three piece fitting consisting of: 1. Female thread nut. 2. Ferrule (sleeve). 3. Straight connector (available in elbow connection).

INVERTED FLARE FITTING

A two piece fitting consisting of: 1. Male thread nut (tubing must be flared). 2. Straight connector (available in elbow connection).

FLARE FITTING

A two piece fitting consisting of: 1. Long shank female thread nut (tubing must be flared). 2. Straight connector (available in elbow connection).

In order to connect point X with point Y it is advisable to use a loop in the line, to provide flexibility in making the connection. Either a straight connector or an elbow connection may be utilized.

Example of how loop in the tubing facilitates making this connection on a Novo 1? HP fule line where the tank is directly below the carburetor fitting and the fuel pump lever is in with the carburetor fitting.

There are a number of types of tubing fittings available. Each type of fitting must use only the parts for that type of fitting. Almost all of them use a special thread pitch. Any one of the three types shown may be used to meet your needs. It is mainly a matter of personal preference, where flow, rather than pressure is involved. The inverted flare fitting is probably the most secure and would withstand more abuse and pressure than the other two types. Both the SAE flare and the inverted flare fittings require a special tool to flare the end of the tube. A double flare is highly recommended rather than a single flare on both types. The compression fitting has an advantage over the other fittings in that it requires no special tools to make the connections. The ferrule, or sleeve, is merely pushed on the end of the tube and the nut locks the ferrule to the tube. To obtain a more flexible connection with the same simplicity the compression type fitting is also available with a neoprene sleeve in place of a brass sleeve. This fitting is also quite expensive but does serve greater flexibility of the tubing after installation.

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