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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Description

🌟 Elevate your shower game with KOHLER’s precision pressure balance—comfort and safety in perfect harmony!

GENUINE KOHLER QUALITY - Authentic parts engineered by KOHLER for optimal performance and extended product life.
SEAMLESS COMPATIBILITY - Designed to retrofit KOHLER K-304 & K-11748 shower valves effortlessly—upgrade without hassle.
ENGINEERED FOR LONGEVITY - Crafted from resilient materials that resist aggressive water conditions, guaranteeing years of reliable use.
SAFETY MEETS PERFORMANCE - Built-in temperature limit stop offers antiscald protection without compromising on your ideal water warmth.
CONSISTENT COMFORT ALWAYS - Rite-Temp tech stabilizes water pressure to prevent sudden temperature swings, ensuring your shower stays perfectly balanced.

The KOHLER GP876851 Rite-Temp Pressure-Balancing Cartridge and Mixer Cap Kit is a durable, easy-to-install retrofit solution compatible with KOHLER K-304 and K-11748 shower valves. Featuring advanced pressure-balancing technology and a temperature limit stop, it ensures consistent water temperature and antiscald protection. Made from long-lasting materials, this genuine KOHLER part guarantees reliable performance and safety for your shower system.

Specifications

Material	Plastic
Brand	KOHLER
Item dimensions L x W x H	7.5 x 4.5 x 2.5 inches
Exterior Finish	Bronze
Inlet Connection Size	0.5 Inches
Inlet Connection Type	National Pipe Tapered
Outlet Connection Type	Hose
Number of Ports	2
Outlet Connection Size	0.5 Inches
Global Trade Identification Number	00885612416223
Manufacturer	Kohler
UPC	885612416223
Part Number	GP876851
Item Weight	7.5 ounces
Product Dimensions	7.5 x 4.5 x 2.5 inches
Item model number	GP876851
Is Discontinued By Manufacturer	No
Size	SINGLE
Color	Black
Style	Balancing Unit
Finish	No Finish
Thickness	1 Yards
Item Package Quantity	1
Measurement System	Metric
Included Components	GP800820 PBU, GP77759 CAP
Batteries Included?	No
Batteries Required?	No

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