Hi, yesterday I received a pump service pack for Enders petrol (gasoline) stoves. This pack is marketed by fellow CCS member Sefaudi, and consists of a set of three individual service kits so you have no excuse for not carrying a spare! Each kit contains a one-piece pump piston/leather washer assembly and two Viton "O" rings. The tiny one provides the air seal for the piston during pumping, the other provides the pump-tube/tank seal. These Enders stove pumps use a one-piece piston/leather washer assembly and Sefa had produced a "better than original" version: I was using a kit on my Enders 9060D stove, and here you can see the individual parts of the kit laid out alongside the stove parts. Here is the reassembled pump unit ready for installing in the fuel tank of the stove: Finally we have the stove operating and successfully completing the Kerophile "Tea Test": Well as you can see the stove works very well with its new "Sefa" pump service kit. The pump is now very smooth and positive, pressuring the stove quite quickly with little effort. Previously with this stove you had "hit-or-miss" strokes, which made for frustrating and inefficient pumping, and spoiled my pleasure of using the stove As with all Sefa's products these kits are exceptionally well made and packed. I would certainly recommend them. Best Regards, Kerophile.