For lovers of Saito FG-11 engines we have this exhaust plug available. 

At the end of our day of flying in these types of engines the excess oil is leaking from the exhaust, which is a nuisance when storing it in our car to transport it home . 

Many of us place a piece of napkin on the exhaust so as not to ruin the carpet of the car and the other airplanes that remain under it in our rack with the oil leak. Now with this plug we no longer have to use napkins or check if there is any residue inside the exhaust before flying. This is made in 3D printing with a flexible material called TPU, it has 2 printing sides, on one side remove before flight and on the other side ultra stick 10cc.

NOTE: DOES NOT INCLUDE ENGINE, DOES NOT INCLUDE EXHAUST, DOES NOT INCLUDE PLANE, the photos are for reference so that the buyer can see the keychain cap