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The Hydrotech Vessel Wrench for 1240 Series RO Systems fits all Hydrotech 1240 Reverse Osmosis systems. This vessel wrench is also known as Hydrotech 1240 part number 21401240. The Hydrotech Reverse Osmosis Vessel Wrench fits the following 1240 models: E-Series, M-Series and Pro Series.
To make sure you are using the correct Hydrotech vessel wrench for your system, find the model number on the silver sticker located on the back of the dust cover. If your model number begins with 1010, 1230 or HTF, then your system will use part number 21401003. If your model number begins with 1240, your unit will use part number 21401240.