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Fitting Fixer

(5 customer reviews)


  • Repairs the sealing surface on 37° steel and aluminum fittings.
  • Utilizes an inverted cone, diamond-dust coated lapping head.
  • Works with a drill (all sizes) or tap handle (sizes -3 to -6).
  • Includes a custom storage case.

– Free shipping on orders over $99 in the continental United States.
– International orders: Please contact us to place an order.

PATENT US 9,943,942 B2

* Sizes correspond to tubing O.D. See the JIC thread chart below.
* Small Set: 3/16″ – 1/2″
* Large Set: 5/8″ – 1″

Select size to view image and part #

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An imperfection on the sealing surface of a fitting can cause it to leak. And what if it is a weld-in bung? In the past you would have to replace the fitting, a major headache, but now you can repair it on location. The Fitting Fixer utilizes an inverted cone, diamond-dust coated lapping head to repair the conical surface and restore the seal with the flared tube.

Using this tool is simple.  The damaged fitting screws into a guide that holds it in place. Next, connect the lapping head to a drill and spin it intermittently about a half dozen times. Inspect the sealing surface to see if there are any imperfections. If damage is still visible, repeat the lapping process until you have a clean surface.

Using Fitting Fixer

Screw fitting into guide

1. Screw the fitting into the appropriate sized guide.

Attach lapping head to drill

2. Connect the lapping head to a drill extending it at least 1/4" from the end of the chuck.

Spray lube into lapping head

3. Holding the lapping head upward, spray a light lubricant into the cavity. This allows the lube to stay inside.

Insert lapping head into guide

4. Insert the lapping head into the guide and over the fitting.

Spin lapping head

5. Spin the lapping head on the fitting, releasing every 2-3 seconds to prevent clogging of the abrasive residue.

Inspect the sealing surface

6. After about 5-6 passes with the drill, remove the fitting. Next, clean and inspect the sealing surface. Repeat step 5 if necessary.


Chart showing JIC fitting thread sizes

5 reviews for Fitting Fixer

  1. Brad Shamo

    I had a damaged fitting on my oil pan and used the fitting fixer. This was very helpful so I didn’t have to pull the motor and take the oil pan off. It worked fantastic, making a nice new sealing surface on the fitting. It is a very good quality tool and customer service is fantastic. I would recommend purchasing one if you need to do a repair!

  2. mark aney

    Used the -16 Fitting Fixer on 2 aircraft boost pumps where the fitting was part of the main housing that was leaking.
    The 37 degree angle cleaned up perfectly and the housing was saved.

  3. Rick Milinazzo

    I was able to repair the damaged welded in bung on my radiator in about 30 minutes without removing the radiator from the car. I tried the fitting fixer and took the car to the track last weekend. No more leaky connection. Without this tool I would have had to incur the costly process of removing the radiator, having the old fitting cut off and a new one welded on. Highly recommend this product.

  4. Jerome Boucher

    This tool worked perfectly. I damaged to An fitting on an oil pan when dropping an engine in a car. This allowed me to repair the fittings from underneath the car without pulling the engine out again! This tool can be a savior!

  5. David Brister

    I used these on my dry sump tank after it was damaged. The fittings came out perfect. Thank you

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Additional information

Select Size

Small Set, Large Set, Single 3/16", Single 1/4", Single 3/8", Single 1/2", Single 5/8", Single 3/4", Single 1"