Bob recently asked about dripping Grohe faucets installed in some Legend-series/era Hunters. I had the same issues on my 1994 40.5 and found that repairing the cartriges (which are ceramic) isn't an option. Anyhow, the replacement part numbers are no longer as described in my manual and it took some hunting on my part to figure it out. Although the sink and vanity faucets ("Classic Series") started out having slightly different cartriges, they are in fact interchangable and now both are replaced by part numbers 45-883-000 and 45-882-000 (left and right hand). In addition, you may want to get new handle fittings if you do not wish to re-use the old ones 45 001 000. I replaced all of mine on both faucets. While not cheap, the cost of new quality faucets is more and way more for Grohe. (See the link for the Internet source where I purchased mine.) To remove the handles, take a smallish flat-blade screwdriver, tape the blade, insert under the handle between the handle bottom and base flange, twist and pull on the handle and it will pop off. You will need a metric box-end wrench to remove the cartridge, It will be helpful to have another wrench on the other side to hold the faucet since you will have to use quite a bit of force to loosen it. This applies to TDL handles and perhaps others without screws holding them to the cartriges (Grohe sells the same faucets with a variety of handles). Anyhow, it was well-worth the cost to stop the pump from cycling at night and to simply stop the drips. Good luck, Rick D.