Can I keep my existing shower valve and trim and just attach this to the shower head spout?
The Grohe 27 421 can be used with your exsiting shower trim and valve. I would recommend speaking with your contractor first.

Please note that this system does not include a shower trim/valve. Example of trims you could use with this system Grohe 19 457, 19 312, 19 411, 19 595, 19 866 & many more
This product is listed under the following manufacturer number(s):
*Denotes a finish or option that has been discontinued
The Grohe 27 421 can be used with your exsiting shower trim and valve. I would recommend speaking with your contractor first.
The Grohe 27 421 is CSA approved.
The Grohe 27 421 does not require a wall supply elbow. The item is installed as a standard shower installation with a built in diverter. Below you will find a link to the items Specification sheet so that you can see what it is I am trying to explain. http://www.faucetdirect.com/mediabase/specifications/z27421us.jpg
The Grohe 27 421 is aprox 40" in height and can be placed at your desired level.
The shower head is 6 5/16" in diameter. You can attach any head with a 1/2" connection.
The Grohe 27 421 can be used with the 34 182.
The Grohe 27 421 will also need a pressure balance valve to control turning water on and off and temp, here are a few grohe list to go with it Grohe 19 457, 19 312, 19 411, 19 595, 19 866 & many more.
The Grohe 27 421 is the shower head and handheld only, you would still need a valve and shower trim to make it fully functional.
Unfortunately, the Grohe 27 421 is not available in Brushed Nickel.
The Grohe 27 421 has only one hose which connects to the diverter on the exposed shower pipe and the other end to the hand shower
The hot and cold water supplies attach to the rough in valve.
The Grohe 27 421 is not meant to be combined with any other valve, trim, or feature.
The Grohe 27 421 is a shower pipe with hand shower and shower head. This unit requires a shower trim and rough-in to operate
The Grohe 27 421 can use many different shower valve trims. The valve would depend on the shower trim chosen.
The Grohe 27 421 only comes in Starlight Chrome.
The Grohe 27 421 showerhead can be adjusted at up to a twenty degree angle.
| Spray Pattern | Rain |
|---|---|
| Handle Material | Metal |
| Diverter Included | Yes |
| Showerhead | Single Function |
| WaterSense Certified | No |
| Mounting Type | Wall Mounted |
| Theme | Contemporary / Modern |
| ADA | Yes |
| Slide Bar Included | Yes |
| Number Of Bodysprays | 0 |
| Valve Included | No |
| Pressure Balanced | No |
| Flow Rate (GPM) | 2.5 |
| Escutcheon Included | No |
| Bodysprays Included | No |
| Product Weight | 17.2431 |
| Spray Settings | 3 |
| Handshower Included | Yes |
| Showerhead Shape | Round |
| Material | Brass |
| Handles Included | Yes |
| Handle Style | Lever |
| Showerhead Width | 6.31 |
| Extension | 17.6875 |
| Number Of Handles | 1 |
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