Bump Tube Form Standard

[jnelson33]

Hello All,

We're finding it difficult to source the specification for what the aftermarket is calling a bump tube fitting.

This fitting was popular on USDM brands for several decades and might still be used on some legacy vehicles like Ford's E-Series vans.

Regardless, the best I can research is that it could be a push connect fitting, or bump tube. Bump tube is by far the most popular name in the zeitgeist.

Here are some pictures.

• This one shows the standard tube form with sliding nut: An O-ring typically installs on the tube and sits adjacent to the flange formed in the tube. Note the slight flare on the tube's end.

• This one shows an aluminum adapter fitting that also has the flared style tube.

• This one shows a straight form instead of a small flare.

Any help is appreciated: Thanks in advance!