[catkimball]

When I take off the tub control handle, there are two copper screws - one for hot water and one for cold water. Which way to I turn the screws (clockwise/counter clockwise) to increase the flow mixture/decrease the flow mixture so that I can actually get a warm shower? There's too much cold water coming in and not enough hot water.

[speedball1]

What's the brand name of your tub valve? Back to you, Tom

[massplumber2008]

Hi all:

Catkimball... Those screws are just integral shutoffs. You want to open these to maximum by turning both screws COUNTERCLOCKWISE. This will allow full volume flow and correct pressure balance at your valve.

To increase the temperature of water available at the valve you will need to adjust the TEMPERATURE LIMITING DEVICE that is part of your valve... ;)

In the picture below, for example, a SYMMONS shower valve has shutoffs (see image) and a temperature limiting screw. To increase temperature here, the screw is loosened in small increments to allow the handle to be turned to a hotter water setting.

To tell you more, as Tom suggested, we need to know the name brand on your valve...

Let us know...

MARK