Those are a bit of a pain to get primed with a low volume of water, might not be what your looking for. A garden hose should be enough to feed it but, just the amount of water in a diswasher probably isnt enough, a utility pump might be better suited.
Take the socket back to the store they should exchange it. Or call the 1-800 number on the packslip, its danaher, tell them it was missing they will mail you one at no charge.