Plumbing Forum - Professional & DIY Plumbing Forum > General Plumbing Discussion > Showers and Tubs > Modify Tub/Shower Valve Port Size




Reply
 
LinkBack Thread Tools Display Modes
Old 07-26-2013, 06:35 PM   #1
ddocfletcher
Junior Member
 
Join Date: Dec 2011
Posts: 25
Default Modify Tub/Shower Valve Port Size

Greeting's, I have a Kohler 11748 bath/shower valve which with built in diverter. I was planing to install it with the tub port to the shower and shower port to the tub. This was to make the water go to the shower without pressing the diverter. However shower port hole is smaller than the tub port hole. I'd like to know if I increase the smaller port hole size will I get more water out of it?



__________________
ddocfletcher is offline  
 
Reply With Quote Quick reply to this message
Old 07-26-2013, 09:49 PM   #2
AQualityPlumber
Plumber
 
AQualityPlumber's Avatar
 
Join Date: Jul 2012
Location: Seattle, Washington
Posts: 107
Liked 13 Times on 11 Posts

Default

You'll probably get more flow to the head but your head will restrict the flow.



__________________

A Quality Plumber Inc.
www.PlumbingWA.com
www.plumbingwa.blogspot.com

AQualityPlumber is offline  
 
Reply With Quote Quick reply to this message
Old 07-27-2013, 12:28 AM   #3
ddocfletcher
Junior Member
 
Join Date: Dec 2011
Posts: 25
Default

That's fine. My purpose is to use the tub port for the shower head and drill the shower head port hole larger so the tub will fill at the full 5 gallon per minute.

Doing this will make it so when the water is turned on it will go directly to the shower head instead of the tub. So to fill the tub the diverter will need to be pushed in.

So will increasing the shower port hole allow full flow to the tub?

__________________

Last edited by ddocfletcher; 07-27-2013 at 02:21 PM.
ddocfletcher is offline  
 
Reply With Quote Quick reply to this message
Old 07-28-2013, 04:42 PM   #4
AQualityPlumber
Plumber
 
AQualityPlumber's Avatar
 
Join Date: Jul 2012
Location: Seattle, Washington
Posts: 107
Liked 13 Times on 11 Posts

Default

I would imagine it would. Larger the port, the more flow. I am not sure if you will get more flow out of the cartridge though. If it is a modern cartridge it will have plastic ports for the water to flow through. Drilling out the valve body will increase gpm but the cartridge may still restrict your flow.

__________________

A Quality Plumber Inc.
www.PlumbingWA.com
www.plumbingwa.blogspot.com

AQualityPlumber is offline  
 
Reply With Quote Quick reply to this message
Old 07-29-2013, 03:40 AM   #5
ddocfletcher
Junior Member
 
Join Date: Dec 2011
Posts: 25
Default

Thanks for getting back to me. It is a kohler 11748ks. All brass, made for shower head (Main Port) and hand shower (Secondary Port). So I am hoping making the secondary port hole the same size as the primary I will be able to use it as a tub filler.



__________________
ddocfletcher is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Septic too small. No land to modify. russ0943 Septic Tanks 2 02-12-2013 03:42 PM
another Shower valve ID please ratdog33 Showers and Tubs 3 12-16-2012 10:43 PM
Cannot id shower valve. toughguy Showers and Tubs 2 08-31-2011 08:20 PM
Modify the PVC pipe under the wash hand basin yslhm General Plumbing Help 5 06-22-2011 05:04 AM
Need help with shower valve OD354 Showers and Tubs 22 05-28-2011 08:13 PM