How to install a PBU with a mixer Cap?

If installing a new PBU with an existing mixer cap, install the medium O-rings, (#2 from Fig. 1), and large O-ring, (#4 from Fig. 1), onto the existing mixer cap (Fig. 2). NOTE: If installing a new PBU with a new mixer cap, the new mixer cap will include the new medium O-rings and large O-ring.

Where are the PBU rings on a Kohler shower?

See the “Identify a Single Control Bath/Shower Valve” help topic for more information. Place the small O-rings, (#3 from Fig 1), on the back of the PBU. The PBU location for the O-rings is oval-shaped but the small O-rings are flexible enough to fit into the location (Fig. 3). Proceed by reinstalling the PBU and mixer cap into the valve body.

How to use the Kohler gp500520 shower pressure balancing unit?

Be sure to lubricate all gaskets and press the GP500520 Shower Pressure Balancing Unit in firmly, otherwise the water may continue to flow out of the spout even though the lever is completely shut off. I hope this information is helpful. Bravo – our shower works again!

Do you need a brass cap for a PBU?

NOTE: If installing a new PBU with an early pressure-balancing valve brass cap (three-ribbed stem model), the installation requires the GP876851 mixer and PBU combination. See the “Identify a Single Control Bath/Shower Valve” help topic for more information.

If installing a new PBU with an existing mixer cap, install the medium O-rings, (#2 from Fig. 1), and large O-ring, (#4 from Fig. 1), onto the existing mixer cap (Fig. 2). NOTE: If installing a new PBU with a new mixer cap, the new mixer cap will include the new medium O-rings and large O-ring.

Is the gp500520 PBU compatible with the K-304?

However, Kohler discontinued the GP500520 PBU and replaced it with the GP800820, which Kohler says is NOT compatible with the old K-304. So, the complete fix became the GP800820 PBU AND the replacement mixer GP77759.

How to remove pressure balancing unit from Kohler mixer?

Remove the pressure balancing unit (PBU) using a pliers (Fig. 6). Note: If your mixer cap looks like the below image, replace it with part number GP77759 (Fig. 7). (Fig. 7)

See the “Identify a Single Control Bath/Shower Valve” help topic for more information. Place the small O-rings, (#3 from Fig 1), on the back of the PBU. The PBU location for the O-rings is oval-shaped but the small O-rings are flexible enough to fit into the location (Fig. 3). Proceed by reinstalling the PBU and mixer cap into the valve body.