This gap seal kit for the Piper Seneca is the most complete on the market, as well as the most popular.  It not only offers the flap and aileron seals, but also a stabilator seal for in front of the trim tab, and a flap/fuselage seal to cover the gap between the inboard edge and the fuselage.  Access openings are also provided where access to the hinges is necessary for future maintenance, an important feature left out by other manufacturers.

The seals are made of 2024T3 Alclad aluminum for lighter weight and superb strength. They're coated with a plastic anti-chaff strip where the seal comes into contact with the control surface to prevent any abrasion.

Aircraft respond well to the gap seals as they create a pressure barrier between the high pressure air on the bottom of the wing and the low pressure air on the top of the wing.  Gap seals will add 4-6 mph  to the plane, as well as 100-150 ft/min increase in rate of climb.  stall speeds will decrease in the 1-3 mph range.  Handling is greatly improved, especially low speed handling and stability.

The installation is done with Cherry/Max rivets in the flap and aileron well....no exposed attachment!  This kit looks like it was meant to be there from the factory- not like an afterthought.  It comes complete with everything necessary to install including all hardware and step-by-step instructions.   Price $617.00