What is the difference between the 400H and 400AH?

The 400H is the newer version of the 400AH. The bowl water adjustment on the 400H is integrated into a knob in at the top of the flush valve. On the 400AH, a roller on the refill tube adjusts the bowl water level.

Can i use this to replace a delta toilet fill valvepart RP71188?

The 400H-002 will replace the Delta model. The 400H can adjust to the same height and comes with an adjustable bowl refill knob to control the amount of water going to bowl. With this adjustment you should be able to match both bowl and tank water levels to the original levels. For more information, please contact Fluidmaster’s Technical Service Department, we are available Monday through Friday from 5:30 AM through 5:00 PM Pacific Standard Time. Contact options include Chat www.fluidmaster.com/support E-Mail techsupport@fluidmaster.com and Toll Free 800-631-2011.

Will this work to replace my 300 model on gerber 28-990 1.6gpf?

Yes it will. For any other question feel free to contact Fluidmaster via Chat and E-mail on Fluidmaster com or call our toll free number 800-631-2011 for immediate help. We are available from 5:30 AM to 5:00 PM Pacific Standard Time.

Are these universal or can I replace this on my top flush toilet?

This fill valve is a universal part that will replace most fill valves in use today, including toilets that use a top button to flush. For more information visit our website Fluidmaster.com/support for videos, troubleshooting tips, email, chat with a technician or call toll free 800-631-2011. We are available 5 days a week Mon-Fri from 5:30 am – 5:00 pm PST.

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Fluidmaster 400H Universal Toilet Fill Valve, High Performance, 2-Pack

Fluidmaster 400H Universal Toilet Fill Valve, High Performance, 2-Pack

Product ID: 444782776

Details

Brand
Fluidmaster
Exterior Finish
Plastic
Inlet Connection Size
3.38 inches
Inlet Connection Type
Fill
Item dimensions L x W x H
14.25 x 3.38 x
Material
Plastic

🔇Ultra-quiet operation

🔧EZ-twist height adjustment 9-14 in

🚀2X faster refill rate

309.40 DT

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Description

🚽 Upgrade your throne with the fastest, quietest refill in the game!

HASSLE FREE INSTALLATION - Pre-installed washer and clear step-by-step guide make upgrades painless and fast.
TURBOCHARGED REFILL SPEED - Experience 2X faster toilet refill for zero wait times.
WATER SMART CUSTOMIZATION - Adjust tank and bowl water levels to optimize water savings without sacrificing flush power.
WHISPER QUIET PERFORMANCE - Say goodbye to noisy toilets with ultra-quiet valve operation.
UNIVERSAL FIT ADJUSTABLE - Fits most toilets with easy EZ-twist height adjustment from 9 to 14 inches.

The Fluidmaster 400H Universal Toilet Fill Valve 2-Pack delivers industry-leading performance with 2X faster refill rates and ultra-quiet operation. Designed for universal compatibility, it features EZ-twist height adjustment (9-14 inches) and customizable water levels to maximize efficiency. Installation is streamlined with a pre-installed washer and clear instructions, making it the go-to upgrade for noisy or slow toilets. Backed by a 7-year limited warranty, this high-performance valve is a must-have for modern, water-conscious homes.

Specifications

ASIN	B09PCXSQJM
Best Sellers Rank	#73 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Toilet Flush Valves
Brand	Fluidmaster
Brand Name	Fluidmaster
Connector Type	Threaded
Customer Reviews	4.6 out of 5 stars 1,296 Reviews
Exterior Finish	Plastic
Global Trade Identification Number	00039961033437
Included Components	Toilet Fill Valves
Inlet Connection Size	3.38 inches
Inlet Connection Type	Fill
Item Dimensions	14.25 x 3.38 x 6.88 inches
Item Highlight	2X faster bowl refill, Quiet operation, Adjustable tank and bowl water levels, EZ-Twist 9–14 in. height
Item Type Name	High Performance Tank and Bowl Water Control
Item Weight	1.4 pounds
Item dimensions L x W x H	14.25 x 3.38 x 6.88 inches
Manufacturer	Fluidmaster
Manufacturer Part Number	400H-5003
Manufacturer Warranty Description	7 year limited
Material	Plastic
Material Type	Plastic
Model Number	400H-5003
Number of Items	2
Number of Packs	2
Number of Pieces	2
Outlet Connection Size	3.38 inches
Outlet Connection Type	PEX
Set Name	2-Pack
Size	2- Pack
Specification Met	ASSE, FM, UPC
Thread Size	1/4 inch
Thread Type	Twist
UPC	039961033437
Unit Count	2 Count
Valve Type	Toilet Fill Valve

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