The Danco HC660 HydroClean is an anti-siphon toilet fill valve with a built-in side-arm cleaning tube that diverts a small stream of water under the rim of the bowl with every flush, helping prevent staining at the waterline without chemicals or scrubbing. It adjusts from roughly 7 to 13 inches in height to fit most standard toilet tanks and is compatible with toilets using 1.28 to 3.5 GPF. Installation is a straight swap for the existing fill valve and typically takes under 15 minutes with no tools.
Will the HC660 fit my toilet tank?
The HC660 is designed as a universal replacement and fits most standard two-piece and one-piece toilet tanks with a two-inch flush valve. It adjusts in height from roughly 7 to 13 inches, which covers the vast majority of residential tank depths. It works with toilets rated at 1.28, 1.6, 1.9, or 3.5 gallons per flush. If you have an older toilet with a very large or unusually shaped tank, double-check the fill valve opening size at the bottom before purchasing.
What does the cleaning tube actually do?
The side-arm cleaning tube is a small hose that clips to the fill valve and routes a stream of water into the overflow tube each time the tank refills, directing it under the toilet bowl rim. This rinse helps break up mineral deposits and waste residue that build up at the waterline and under the rim over time. It does not replace manual cleaning, but many users report fewer stains and mineral rings compared to fill valves without the feature. The tube is pre-attached and requires no additional setup.
How difficult is it to install the HC660?
Replacing a fill valve is one of the simpler toilet repairs and typically takes 10 to 15 minutes. You shut off the water supply valve behind the toilet, flush to empty the tank, disconnect the supply line, unscrew the old fill valve locknut from under the tank, drop in the HC660, hand-tighten the locknut, reconnect the supply line, and turn the water back on. No special tools are required beyond an adjustable wrench or pliers for the locknut. Detailed instructions are included in the package.
Is the HC660 noisier than a standard fill valve?
Some users note a slightly different refill sound compared to quieter side-float fill valves, though most describe the HC660 as acceptable. The noise level depends in part on water pressure in your home — higher pressure can make any fill valve louder. If sound is a concern, the fill rate can be adjusted using the adjustment shank on the valve body, which slows the refill and typically reduces noise. Overall most reviewers describe the fill valve as working well without objectionable noise.
How long does the HC660 typically last?
Most users report years of trouble-free operation. Danco covers the HC660 under their standard product warranty. Longevity depends primarily on local water quality — hard water with high mineral content can shorten the life of any plastic fill valve. If the valve starts running intermittently or taking longer to shut off after a few years, the rubber seal inside is usually the culprit and can be replaced without buying a new valve.
# Danco HydroClean Water-Saving Toilet Fill Valve with Cleaning Tube **Model:** `HC660` **Brand:** Danco **Category:** Fill Valve > The Danco HC660 HydroClean is an anti-siphon toilet fill valve with a built-in side-arm cleaning tube that diverts a small stream of water under the rim of the bowl with every flush, helping prevent staining at the waterline without chemicals or scrubbing. It adjusts from roughly 7 to 13 inches in height to fit most standard toilet tanks and is compatible with toilets using 1.28 to 3.5 GPF. Installation is a straight swap for the existing fill valve and typically takes under 15 minutes with no tools. ## Specifications | Attribute | Value | |---|---| | Type | Fill Valve | | Style | Anti-siphon ballcock replacement | | Material | Plastic | | Height In | 10.50 | | Width In | 3.00 | | Adjustable Height | 7–13 in | | Compatibility | Universal — fits most 2-inch flush valve toilets | | Gpf Range | 1.28–3.5 GPF | | Includes Cleaning Tube | Yes | | Pkg Height In | 12.60 | | Pkg Width In | 3.15 | | Pkg Length In | 3.19 | ## What's Included - HC660 fill valve body - Side-arm cleaning tube - Installation instructions Source: https://www.jaspecs.com/danco/fill-valve/hc660-danco-hydroclean-toilet-fill-valve/