what comes in the box? O rings? lube?

Yes, o-rings and really small tube of lube. But I purchased a separate tube of Danco silicone grease to have at hand.

What is the part number for the servicing kit with the o-ring? One poster said it comes with the kit. The video doesn't?

The valve with the o-rings and small tube of silicone gel is all one item, part number GB876851.

I have a kohler forte and it's leaking. should i get this newer model or the previous model gp76851 mixer & pbu sp kit?

Depends how old you valve is. If it is older you should get the gp76851

What are the flow specifications?

Not sure. If you have the kohler 304 valve this is the cartridge for that valve. Its cartridge and balancing spool. Its comes in 2 parts. You can google it and they might be able to tell you the specifications

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Part GP876851 Rite-Temp Mixer and Pressure-Balancing Unit Kit, SINGLE, Black

Product ID: 117620005

Details

Material
Plastic
Brand
Kohler
Item dimensions L x W x H
19.1 x 11.4 x
Exterior finish
Bronze
Inlet connection size
0.5 inches
Inlet connection type
Solder

⚖️Precision pressure balancing

🌡️Rite-Temp temperature stability

🛠️Easy retrofit installation

EC$897

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Description

🌟 Elevate your shower game with precision and durability — because comfort is non-negotiable.

EFFORTLESS UPGRADE - Retrofit your existing shower valve with ease—no complex plumbing required.
SEAMLESS COMPATIBILITY - Designed specifically for Kohler K-304 and K-11748 shower valves for a perfect fit every time.
ENGINEERED FOR LONGEVITY - Built to resist aggressive water conditions, guaranteeing durable, long-lasting performance.
CONSISTENT COMFORT ALWAYS - Rite-Temp tech ensures stable water temperature, eliminating sudden cold or hot shocks.
CERTIFIED QUALITY ASSURANCE - Meets all industry codes and standards, backed by genuine Kohler engineering.

The Kohler GP876851 Rite-Temp Mixer and Pressure-Balancing Unit Kit is a genuine Kohler replacement part designed for seamless retrofit on K-304 and K-11748 shower valves. Featuring advanced Rite-Temp technology, it maintains consistent water temperature by balancing pressure fluctuations, ensuring a safe and comfortable shower experience. Engineered to withstand harsh water conditions, this black balancing unit offers long-lasting durability and meets all required plumbing codes and standards.

Specifications

Manufacturer	Kohler
Part Number	GP876851
Product Dimensions	19.05 x 11.43 x 6.35 cm; 213.19 g
Item model number	GP876851
Size	SINGLE
Colour	Black
Style	Balancing Unit
Material	Plastic
Thickness	1 Yards
Item Package Quantity	1
Measurement System	Metric
Included Components	GP800820 PBU, GP77759 CAP
Batteries included?	No
Batteries Required?	No
Item Weight	213 g

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EC$897

Duties & taxes included

In stock

Sold byAmazon Saint Vincent and the GrenadinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Saint Vincent and the Grenadines.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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