the device is priceless. The only negative aspect are the rubber seals that are somehow not really be reordered. I Händle this now so that I purely put the seal into the engine block and to turn with an empty cup and then top screw the jar Wanted to reorder additional seals, which would, however, become expensive as a new device and so I've just bought to a second device. Mathematically, that's always a good deal. ca. 19.- costs a new device and it scratched me not really, if a device would hold just 2 years. As I said a purchase is worth it, so far as one's patience has determined carefully turn the seals. It can very quickly go wrong when you're in a hurry
