A reviewer complained that this is actually a Fluidmaster 400A. Is that what you got or was that reviewer ripped off?

It's a variation on the 400 series. Fluidmaster makes maybe over a dozen different versions including OEM versions sold by Kohler, PerforMAX versions, ones with brass shanks, etc. The only thing that seems to be exactly the same among all versions is the float and the (replaceable) seal. Almost every Fluidmaster fill valve (including the 747PRO) uses the Model 242 seal. As others noted, it comes with a set of restrictor inserts to reduce the amount of water going into the bowl. You want to use the one that just manages to fill the bowl to the maximum around the same time as the tank is filled. I found the green one is installed in 400A valves in an American Standard Cadet 3. Those factory installed valves are EXACTLY the same as retail 400A valves, except for the insert and that they use a hex nut (which requires a tool to install/remove) rather than a wing nut that has to be tightened/loosened by hand. Someone mentioned the roller clamp in the PerforMAX. Fluidmaster has a newer one (400H) that uses a dial that varies the restriction. Much easier to adjust than the roller clamp. Fluidmaster has also been adding a bigger adjustment knob to most of its fill valves, so the photo might not reflect that yet.

I purchased a Kohler Fill Valve that requires you to adjust the length of the stem by turning one part in or out...Mine will not go smaller or larger?

Mine had the same problem! It just spun. Somethign was stuck and I got extremely frustrated. The directions said to turn, but that did nothing. Turns out the whole base can be pulled straight out if the retaining collar is slid upward. After sliding that collar up, give it a good yank. Just don't break the valve and float at the top; I just about did. This fluidmaster video explains how. It's not the exact match, but is pretty much the same exact setup since Fluidmaster makes the official Kohler fill valve. Watch this video and you'll see what I mean: https://youtu.be/3Q-VzqqH5dg?t=1m22s

This says universal. Can it replace the old ball and arm style fills valves?

Well my Kohler toilet had a Ball and arm that came in it originally and it started leaking, and I used this to replace it. Was really quite easy to do, most difficult part is removing the water inside the tank that's left over after you turn off the water and flush. I used several old towels. You could also if you had enough space undo the fill valve and have a container to catch the water. Other than that its quite easy.

Does the Washer, Locknut and Clip come on this like the original Kohler part this replaced OR is it no longer needed with the new replacement?

All required washer locknut and clip come inside the package- yes you still need them as it will install as an exact match to what was there previously

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🚽 Upgrade to silent efficiency—because your bathroom deserves the best!

WHISPER QUIET REFILL - Experience tranquility with silent fill technology that eliminates noisy tank refills.
UNIVERSAL COMPATIBILITY - Adjustable height ensures a perfect fit across a wide range of Kohler toilets—no guesswork needed.
GENUINE KOHLER ASSURANCE - Protect your investment with an authentic part engineered by Kohler for lasting durability and warranty compliance.
COMPLETE INSTALLATION KIT - Includes valve, inserts, fill hose, and hardware for a seamless, hassle-free upgrade.
TAILORED WATER EFFICIENCY - Optimize water use with multiple fill-rate inserts designed to conserve without compromising performance.

The KOHLER GENUINE PART GP1138930 Silent Fill Toilet Fill Valve Kit delivers a quiet, efficient refill experience with adjustable height and multiple fill-rate inserts. Designed exclusively for Kohler toilets, this genuine part ensures optimal performance, water conservation, and easy installation, safeguarding your product warranty and enhancing bathroom comfort.

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Manufacturer	Kohler
Part number	GP1138930
Item Weight	1 g
Product Dimensions	33.02 x 8.89 x 7.62 cm; 1 g
Item model number	GP1138930
Size	12.5" x 3.5" x 3"
Color	Colors may vary
Style	Plumbing Overstock
Finish	No Finish
Material	Metal Plastic
Pattern	Kit
Shape	shape
Item Package Quantity	1
Specification met	RoHS, PED, MD
Special Features	Adjustable
Included components	valve, inserts, fill hose, and assembly hardware
Batteries Included?	No
Batteries Required?	No

KOHLER GENUINE PART GP1138930 Silent Fill Toilet Fill Valve Kit

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