EotE page 255 - The Syliure-25 hyperdrive sled "Designed to add hyperspace capabilities to smaller ships without hyperdrives." It gives a class 2 hyperdrive to a sil 3 ship, good for five jumps.
hyperspace rings could use better definition. saying that they have 5 uses seems a bit odd. i mean, having only 5 pre-programmed jumps makes a bit more sense, especially it the ship doesn't have an astromech to program them. but 5 jumps before non-use at a cost of 10,000 credits does not seem very cost effective for any consumer. i mean, for the supplier it makes sense, as it causes the consumer to buy more... but who would buy such a costly hyperdrive for so few uses?
"we could almost buy our own ship for that much. we don't have to sit here and take this"~ luke skywalker
Hmm that does seem a bit silly. However, Reading that it just makes me think the fuel tank can only be used for 5 jumps. After that you will have to fill'er'up. Normal ships have the "Consumables" to limit how long they can travel free space before making a stop. I believe this follows the same behavior forcing the user to come back for a refresh.