We bought our Moen one hand faucet a number of years ago.  Last week it just started leaking like crazy.  The water was apparently running back into the faucet and down under the sink.  It was detected when a giant puddle formed on my kitchen floor, seeped under the linoleum, soaked the floorboards and base of the sink cabinet.  All of the faucet pipes under the base plate were corroded.  Then we had to buy a new one because we could not find the receipt, which, due to the age of the item, one would not have handy. And we were unable to replace for the exact model we had as no one seems to carry it any more.  Why is the receipt so important when I have the broken faucet and it is all corroded, not intentionally damaged.  Very dissapointed