Model # 35026000

Internet #203664158

GROHE GrohFlex Universal Rough-In System


GrohFlex Universal Rough-In System

$7996 /each
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Frequently Bought Together

Product Overview

By combining superior technology with a choice of breath-taking designs, GROHE can provide you with all the elements to enhance your bathing space. GROHE’s fittings unite a beautifully elegant appearance that can work in a full range of design schemes – from traditional to modern – with quality materials, German craftsmanship and superior innovation for long-lasting performance. The impressive portfolio of products that not only dial up the design quotient, but also leverage technology in clever ways to yield smart and sophisticated homes.

  • 1/2 in. inlets and outlets
  • Fixing points for front and back wall
  • Leakproof housing
  • Integrated service stops
  • Flushing plug
  • Removable protection cover with installation information

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

Is this rough in valve capable of two shower heads. i only need one on at a time. thank you

Is this rough in valve capable of two shower heads. i only need one on at a time. thank you
Asked by: pwinslow
Our set up involves a diverter and valve on the wall for a hand held and a shower bar that is inlet water for the rain head. So if it could handle our set up it should handle yours as well.
Answered by: NSGardener
Date published: 2017-07-11

Does this come with built in Rough-In Valve? Or I have to buy Pressure Balance Shower Rough-In V...

Does this come with built in Rough-In Valve? Or I have to buy Pressure Balance Shower Rough-In Valve separately? I want to install it to Grohe Concetto Pressure Balance Bathroom Combination.
Asked by: justright
You will need to pick up the pressure balance valve, this is the connection center for the plumbing that makes the install so quick and easy.
Answered by: NSGardener
Date published: 2017-07-11

Do you carry remodel replacement covers for grohe shower valves. I have three in gold and would like brushed nickel or antique silver

I have seen them for Delta and Moen, but nothing for Grohe, The rough-in system is the first thing that looks similar as the cover is an oval at this point.
Asked by: Clint
No we do not offer anything like that
Answered by: Grohe Product Expert
Date published: 2016-02-25
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Customer Reviews

GrohFlex Universal Rough-In System is rated 4.8 out of 5 by 10.
Rated 5 out of 5 by from Required for many Grohe systems, installation fairly easy This rough-in system is required for many of the Grohe shower mixers. When first opening the box, it looks complicated, but the instructions help you through various installations -- with and without a tub spout, with and without a diverter. Once installed, the center section comes out easily. The outside plastic is sturdy, yet thin enough to easily cut to the correct depth. There was some minor complexity when first turning on the water. There seemed to be a slight clog which was rectified by blowing through the valve. Installed along with Essence Dual Function Thermostatic Valve in StarLight Chrome (Model # 19988001 Internet #206633708).
Date published: 2017-06-12
Rated 5 out of 5 by from Shop around prices for this rough-in all over the map 40 year old basement bathroom renovation underway and the new fixture selected boiled down to either American Standard, Kohler, or Grohe. Researched all the forums and plumbing sites and chose Grohe base upon the design of the rough-in box and durability of the Grohe shower/tub fixtures. What is important is all fixtures leak and when they do you need replacement parts and repair kits. Grohe is customer oriented and will give complete valves away to verified owners of Grohe fixtures in the event they no longer stock repair kits. Documented clearly on their Facebook page but more importantly I found only one occurrence of a Grohe shower fixture reporting a shower head drip and this was after 12 years of reliable nice is that?
Date published: 2015-09-24
Rated 5 out of 5 by from A great way to simplify shower installation This really simplifies the installation process of installing a shower and tub faucet. It is easy to install to the studs with simple 2x4s and allows for versatility of height. Everything is diagramed and directions are easy to follow. By getting a Grohe shower system you just pop the pieces into the rough in system and you're good to go. It is a real time saver. I have seen concerns regarding the maximum GPM from a 1/2" line but have had no issues with my 2.5 gpm head. I imagine if you are using multiple shower heads simultaneously it will be a factor
Date published: 2017-03-26
Rated 5 out of 5 by from This is our second install using the Grohflex rough in. Our plumber at first was a little concer... This is our second install using the Grohflex rough in. Our plumber at first was a little concerned with the set up, but once he looked at the instructions and made a quick call to Grohe support, he installed our shower unit in record time and commented on how easy it will be in the future to make any changes. We've been relatively new Grohe customers but are now hooked. The fit and finish of their fixtures is superior to most products and offers high quality at a great price point. Consider Grohe and their new Grohflex system on your next bath remodel.
Date published: 2017-07-11
Rated 5 out of 5 by from I received the grohe rough in box in a timely manner. When I took it out of the box it weighed m... I received the grohe rough in box in a timely manner. When I took it out of the box it weighed more than I thought for the size it came in. The unit had clear and easy to follow instructions on it for hook up and fastened easily to the 2x4 framing I had installed. After attaching the grohe dual function handle to this rough in box I noticed how smooth the operation was in switching from one shower outlet to another. Coupled this with the handle and showerhead and am very happy with how my shower turned out.
Date published: 2017-07-05
Rated 5 out of 5 by from very solid The Grohflex universal rough-in system is a neat system. It is used for one rough-in system for many types of installations. This makes it easier for upgrades for function and style. The inlets and outlets are 1/2 in. brass.The grohsafe valve mounts in the box with 4 screws and you do not have any water line connections to make to the valve. I think this type of installation is the best way to go.
Date published: 2017-04-28
Rated 5 out of 5 by from Excellent! Very easy to install. Everything lined up as it should. I will definitely be buying GROHE products again.
Date published: 2017-06-07
Rated 5 out of 5 by from Exceptional valve, misleading marketing My wife and I run a small property business in Western Pennsylvania. We buy, renovate, rent, and sell homes in our area. I am a PA-registered home improvement contractor and head up our small work crew. We have a good deal of experience in mid-level and luxury kitchen and bath renovation work. I got my start as a renovator in Greece, and am therefore quite familiar with GROHE bathroom fixtures, as they have been for generations perhaps the most-well-known and respected bathroom fixture brands in that country. Let’s say right off the bat that this is Model # 35026000, also known as 35 026 000 GrohFlex. If you’re reading these reviews to confirm that this is indeed the extra part that you’re going to need to install a GROHE shower kit you’ve bought on, check that model number. Yes, this component is of high quality, it’s occasionally difficult but not impossible to install, and it will give you good service. Much of the rest of this review has to do with technical details that are primarily important to installers. One thing about GROHE that installers working with its fixtures for the first time should know is that the brand has been making an aggressive push to capitalize on its formidable European reputation and push into different markets. There have been some hiccups in this process. Behind these hiccups is, I believe, a brand mentality carried over from GROHE’s days of being a traditional German manufacturing company that does things “the European way.” As the brand is trying to keep design and engineering in Germany, there’s not really all that much understanding of how things work in other markets. Occasionally, this shows up in glaring lapses in design -- what would obviously be a great product in Germany is a nightmare to work with here. GROHE is clearly making serious efforts to overcome this problem. The GrohFlex system is a case in point.’s a big company. It’s hard to make all the moving parts move correctly. I was worried that this system would be fatally flawed in some way. It thankfully isn’t. GROHE claims loudly that it designed this valve system specifically for the North American market. One of the things that this means, thankfully, that there is some additional documentation that will help installers understand the system as a whole. Let’s start with that. Here’s the link for an installation video about putting in the cartridge from GROHE America. Here’s the link for the product brochure: I put the general product video is in the video link. So you can see from this literature that the GrohFlex will handle five different kinds of configurations and there’s a high-flow cartridge for a luxury shower that just plug into this rough-in. On several other brands, you need to install the high-flow variant of the rough-in to use a high-flow cartridge -- not here. You probably also noticed the cartridges are massive compared with others from American companies like Moen, Delta, and Kohler. I’d like to ask you to take a look at the product brochure, specifically, the photo that shows an installation of this valve into a 2x4 wetwall. If you’ve done this before, try to look at it for a minute and not laugh, I dare you. OK, let’s move on. Take a look at the valve itself. It’s obvious that your simplest installation is going to be into a 2x6 wetwall, with a piece of 2x6 blocking to screw the valve housing into, which is of course best-practice anyway. With this valve, if you’re working with that 2x6 wetwall, you just need to screw in your blocking back against the drywall at the back of the cavity and the measurements for tile come out nicely at the front of the valve. This is because, unlike other systems, you’ve got some serious leeway with setting the depth of this valve. Please take a look at Figure 1, which is a photo of me measuring the full inch and a quarter of leeway you’ve got to get the spacing on the backerboard and the tile right. By comparison with other popular valves, you might have as little as a half-inch. So that’s a good thing, right? Please look at Figure 2, which shows the top outlet of the valve. When it comes to shower valves and especially luxury shower installations, in soldered copper water supply and branch lines do I trust, all others take a number. There are no solder points on this valve, not on the inlets, not on the outlets. If you’re working with copper, and I hope you are, it all goes in with Teflon tape and 1/2 in copper male NPT fittings. That’s not so good, but hey, it’s not a dealbreaker. Trying to heat up all that brass for a solder connection would be a nightmare on a job. Here’s another point: to accommodate the huge cartridges, the valve is very bulky, 6 3/4 inches wide. If you typically put in air chambers at the inlets to arrest water hammer, even if your framing in a bathtub or shower stall was done by someone with brains and you have the valve center dead on the middle of a regular stud bay with, with the valve in place, you will only have about four inches to get those air chamber fittings in. Sure, it’s possible, but it’s going to be tight and you’d better be on the ball with your work. But once you get the assembly done right and you thread in your connections to the water outlets, test the work and find no leaks, oh baby, this thing is IN. This isn’t a thin-walled valve that’s going to fall down and die on you in five, ten, fifteen years. If you take the cover off the outlet and look at the guts of it, it’s astonishingly simple. Please look at Figure 3: There’s just four holes, two in, two out, surrounded by some very heavy brass with cut-off screws operating ball valves on the inlets.. And that means this thing can handle a truly massive amount of water flow as long as the cartridge doesn’t let you down...and GROHE claims their high-flow cartridge in this valve can handle 14 gallons per min at 45 psi. Last point about the cartridge: while this rough-in is made in Mexico, GROHE designs and manufactures their own cartridges in their own facility in Germany. I highly doubt that 1/2 copper pipe can supply 14 gpm at a safe residential water pressure, but hey, it’s always good to know on a luxury shower build that of all things, the rough-in valve isn’t going to let you down. Ultimately, you have to admit these people are smart, but their marketing, well, you can’t have it all. If GROHE could get a serious installation video up that shows this valve going into a 2x6 wetwall, as it’s obviously designed to do, instead of that silly shot of a pretzel installation into a below-standard 2x4 wetwall, that would go a long way to assuaging the worries of renovation outfits like mine. Because GROHE fixtures in the bathroom certainly sells middle-class and upper-middle-class properties. Final verdict, this is a great system. The GROHE design team got it done. The marketing is a bit misleading, as are some of the DIY shots of this going into a 2x4 wetwall backed by wood, but it’s a superior product for anyone willing to do the job up to accepted standards of quality.
Date published: 2016-12-02
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