Drinkwell Reservoir 50 Ounce

Drinkwell Reservoir 50 Ounce
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Works great, but one thing to know if you find the reservoir continually overflowing the bowl: the o-ring lining the grove in the lid is essential! I learned this the hard way - my reservoir did not come with the o-ring, and for the life of me I could not figure out why it kept overflowing the bowl. Finally my scientist boyfriend figured out that without some sort of o-ring to seal it, little bits of air escape out the threads of the lid, causing the water to flow out without stopping. I then read the instructions, and sure enough, there is supposed to be an o-ring in the lid! We ended up finding something at Lowes that worked in a pinch - "TEF Valve Packing 5/32" x 18" rope" - but I'll probably end up calling the manufacturer and request the actual part be sent to me. Works like a dream now - but I rate it one star short of five because it was missing the essential piece!