These are necessary when converting hard tubing over for use with an fittings.

Available in blue, black, Show Polished Red ,SimChrome Polished Silver , Show Polished Purple and stainless steel.

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 -03 fits 3/16" o.d. tubing

-04 fits 1/4" o.d. tubing

-05 fits  5/16" o.d. tubing

-06 fits 3/8 " o.d. tubing

-08 fits  1/2" o.d. tubing

-10 fits  5/8" o.d.tubing

-12 fits 3/4" o.d. tubing