New from Koul Tools – the Surseat hard line lapping tool for brake and fuel systems. This versatile tool can easily clean up the surface of flared lines and even rejuvenate the seal on old lines. See more details below.

Official Release:

Now there’s an easy way to ensure optimum sealing with flared hard lines employed in crucial brake and fuel system applications. The innovative new Surseat tool removes irregularities in the flare and prevents surface risers. In addition to perfecting newly-flared stainless steel, aluminum or copper lines, the Surseat can also rejuvenate the seal on existing brake and fuel lines for restoration projects.

The Surseat operates on the same premise as the ages-old process of lapping engine valves. A precision diamond dust coated lapping head (in either 37° or 45° configuration) literally polishes the flare smooth to perfection.

It comes with collets for 3/16″ to 1/2″ tubing, and collets to accommodate 3/16″ and 1/4″ threaded brake lines. A custom carrying case is also included. The Surseat P-51 kit is a valuable asset for car builders, automotive repair facilities and serious do-it-yourselfers.


  • Removes irregularities in the flare
  • Prevents surface risers
  • Rejuvenates the seal on existing brake and fuel lines