When placed into a dishwasher this reservoir completely distorts and shrinks and is unusable. Why it was not made of dishwasher safe plastic is a real puzzle, especially when the rest of the Drinkwell plastic parts are dishwasher safe.
They could have engraved the fabrication tool(s) to mold the warning into the reservoir.
PETSAFE RESPONSE: We do apologize to hear of the trouble you experienced with your Replacement Reservoir and we can understand how frustrating this must be. Please know that these reservoirs are made of a thinner plastic, and we do recommend to hand wash only. The cleaning instructions are located under "Attaching Additional Capacity Reservoir (available accessory)" in your Drinkwell Original Fountain Manual. You can download a copy of the manual by using the link below. If you have any questions, please contact our Customer Care Center at 1-800-732-2677.