Classic
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Single Handle Centerset Bathroom Faucet in Chrome

Model#: 521-ECO-DST-A
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Classic
View Full Classic Bathroom Collection
Single Handle Centerset Bathroom Faucet in Chrome
Model#: 521-ECO-DST-A
List Price: $19170
Add to Favorites
Find local Delta® installers
PRODUCT FEATURES
Designed for performance, the Classic Bath Collection provides smart technology that will stand the test of time. Delta® faucets with Diamond Seal® Technology perform like new for life with a patented design that reduces leak points, is less hassle to install and lasts twice as long as the industry standard. WaterSense® labeled faucets use at least 20% less water than the industry standard — helping you save water without compromising performance. You can install with confidence, knowing that Delta® faucets are backed by our Lifetime Limited Warranty.
  • Diamond Seal® Technology is less hassle to install and helps your faucet perform like new for life, reducing leak points and lasting twice as long as the industry standard
  • Everything you need is together in one convenient box, including integrated InnoFlex® PEX supply lines
  • Fits 3-hole 4 in. installations
  • Plastic push pop-up drain assembly in matching finish (included) is ADA compliant and simple to install, operate and clean
  • Includes ADA compliant lever handle
  • WaterSense® labeled faucet uses at least 20% less water than the industry standard without compromising performance
  • Rigid spout does not swivel
  • 3/8-inch compression fittings
  • Backed by Delta Faucet's Lifetime Limited Warranty
Special Information
Warning Image
California Prop 65 WARNING
Eco-Friendly
WaterSense® Labeled
Technology and Special Features
ADA Compliant
No-Lead Compliant
Diamond Seal® Technology
Special Information
Warning Image
California Prop 65 WARNING
Documents & Specs
Product Support, Repair Parts & Technical Specifications
View Technical Specifications
View Maintenance & Installation Sheet
View Parts & Accessories Diagram
Register Product
Resources
Design Files
Installation Information
3-hole 4" installation
3-hole 4" installation
Flow Rate :
1.20 gpm @ 60 psi, 4.5 L/min @ 414 kPa
Overall Height (in.) :
5-1/4
Valve Type:
NA

INSTALLATION SUPPORT

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REVIEWS
Rated 4 out of 5 by from I'll use the example it does have great features I bought it because I like Delta and reviewing things in the store this one had good features I liked, single control that could be a lever or knob, selection to limit the hot water temp, and large, plastic, mounting posts that won't corrode. Installed myself with no problems!
Date published: 2023-03-01
Rated 4 out of 5 by from Great faucet I've had only Delta faucets in my house for years. I got this faucet to replace one installed in 1974 and couldn't be opened to replace the parts. I liked the new one when I saw it and bought that one with the water lines, new drain, etc. it had everything needed but the tools. Once the old faucet was removed the installation of the new one was easy. It works great. And with the new diamond seals it should last longer then me.
Date published: 2022-07-16
Rated 5 out of 5 by from Love the look of shiny chrome! I bought this a week ago and so glad I did!
Date published: 2020-08-22
Rated 5 out of 5 by from Nice, sturdy, solid function Nice, good looking, fairly easy to install and solid function. The pex lines are quite long, somewhat difficult to route but seem to work well. Would definitely recommend. Good for kids/spare bathroom.
Date published: 2020-06-04
Rated 4 out of 5 by from Easy installation Selected this model for its practical style and its 3 function removal sprayer. Operation of each spray function was not lacking in anyway and easily met my expectations. Very happy with results. Did feel the need to go on line for installation instructions specific for this model since instructions provided covered several models making them somewhat difficult to follow. This 78 year old is very happy with the ease of installation after removing our garbage disposal for needed access, removing the old faucet, installing the new faucet, replacing the disposal, with all efforts taking about 3 hours to complete.
Date published: 2020-05-28
Rated 5 out of 5 by from good looking products, long lasting I have used Delta products before and have always been happy with them.
Date published: 2020-05-18
Rated 3 out of 5 by from Early problem I bought and installed a #521-DST-A in late 2014. From the outset my wife could not turn it completely off. If she centered up the flow handle, there was a running leak. I wsa more patient in learning how to get a no-leak position for the flow control handle: it was a little beyond the centered position. I have had to somewhat carefully find this position for the last five-plus years. She has been taught to do the same, but complainingly. Recently we have had regular and random visitors who don't know the secret, and I don't try to educate them all. I plan to replace valve cartridge to attempt to fix the problem. My advice to anyone considering purchasing this faucet: don't be surprised if you have annoying difficulty turning flow off completely.
Date published: 2020-04-22
Rated 5 out of 5 by from 20 Minutes . . . OK. So I am NOT a plumber, don't want to be a plumber and when I do plumb, it is at least 5 trips to HD. But This time--One and done--that's it. I removed the old faucet, installed the new one using the attached tubing and it was literally that simple. In fact, it was so simple, I was sure I did something wrong--waited for leaks, refused to replace the contents beneath the sink for 6 hours--I was just sure Niagara Falls v 2.0 was soon to begin. With the new push on supply valves, this was a dream! Thank you Delta for making us epic fail plumber wannabes look like heroes!! You listened and we won big!
Date published: 2019-05-13
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Q&A

How are you supposed to install the crystal handle that comes with the 521-ECO-DSTA. The instructions do not say anything !

Asked by: Ronn
Hello Ronn! Thank you for your question! I am happy to help The Delta 521-ECO-DST comes with an adapter that must be installed on the stem of the cartridge. This will allow the knob handle to be installed. Here is a link to the Installation guide. https://media.deltafaucet.com/MandI/54195%20Rev%20S.pdf Please see the drawing on page 9 Please reach out to us directly if you need further assistance. Best Regards, Antoine
Answered by: Delta7
Date published: 2021-02-01

How do you change the aerator on a Delta Model # 521-ECO-DST-A faucet set? What special tools, parts and instructions are required change the aerator in this faucet set? What is the cost of the materials and parts to do a four faucet sets?

Asked by: Mike
Hi Mike, Thank you for your question about the Delta Faucet model 521-ECO-DST-A. The aerator unscrews from the end of the spout. For this model made after 6/13/2011, a replacement aerator and wrench are part number RP54977-1.2. https://www.deltafaucet.com/parts/product/RP54977-1.2.html Please reach out with any additional questions! Best Regards, Bryan
Answered by: Delta
Date published: 2025-10-20

Does the 521-ECO-DST-A faucet work with a single hole installation? Thanks for your help.

Asked by: Dave44
Hello Dave44, Thank you for your question about the Delta Faucet model 521-ECO-DST-A CLASSIC Single Handle Centerset Bathroom Faucet. I apologize for any difficulty finding this information. We are happy to help! No, this faucet is designed for a 3-hole 4" installation, not for a single hole. Please see the installation manual for more information: https://media.deltafaucet.com/MandI/54195%20Rev%20S.pdf You can browse our selection of single hole bathroom faucets here: https://www.deltafaucet.com/bathroom/sink-faucets/single-hole Please reach out directly at customerservice@deltafaucet.com or 1-800-345-DELTA if you have any questions or need additional assistance. Thank you for being a loyal Delta Faucet customer. Best regards, Bryan
Answered by: Delta Faucet
Date published: 2024-03-28

The new style water lines do not just screw onto the valves . What valves or adapter do I need in order CONNECT this faucet. The red and blue ends extend to far into the nut to catch any threads . The Depot people had no answers!!!!!

Asked by: Fuzztex
Hello Customer! Thank you for your question! We would be more than happy to assist you. We do apologize that you have been having trouble with your installation. The connections to the shut off are compression fittings, they will tighten as you tighten the coupling nuts. Please refer to the video below for the installation of a lavatory faucet below. With any further questions or concerns, please do not hesitate to reach out directly! https://www.deltafaucet.com/video-gallery/install/how-install-deltar-single-handle-bathroom-sink-faucet Best Regards, Carrie
Answered by: Delta7
Date published: 2024-03-28
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PART LIST

PART LIST

1 2 >
Image-Master-RP52833

Classic

Classic Metal Lever Handle Kit - 1H Bathroom

List Price: $40.10 - $54.05
Free Ground Shipping All Orders $49+

RP52833

Image-Master-RP51502

Delta®

Delta® Bonnet Cap

List Price: $18.05 - $49.70
Free Ground Shipping All Orders $49+

RP51502

Image-Master-RP17446

Delta®

Delta® Button - 1H Bathroom, Tub & Shower

List Price: $13.75
Online Price: $11.00
Free Ground Shipping All Orders $49+

RP17446

Image-RP62933

Classic

Classic Gasket

List Price: $19.40
Online Price: $15.52
Free Ground Shipping All Orders $49+

RP62933

Image-Master-RP6146

Delta®

Delta® Lift Rod & Finial - Bathroom

List Price: $29.25 - $36.75
Free Ground Shipping All Orders $49+

RP6146

Image-RP60730

Delta®

Delta® Aerator - Wrench - 0.5 GPM

List Price: $13.95
Online Price: $11.16
Free Ground Shipping All Orders $49+

RP60730

Image-RP73192

Classic

Classic Button - Red / Blue

List Price: $14.50
Online Price: $11.60
Free Ground Shipping All Orders $49+

RP73192

Image-Master-RP60983

Classic

Classic Aerator - Water-Efficient - 1.5 GPM

List Price: $27.35
Online Price: $21.88
Free Ground Shipping All Orders $49+

RP60983

Image-RP53531

Delta®

Delta® Mounting Nuts - 15 / 16 Series

List Price: $27.15
Online Price: $21.72
Free Ground Shipping All Orders $49+

RP53531

Image-RP52221

Delta®

Delta® Adapter & Screw

List Price: $25.95
Online Price: $20.76
Free Ground Shipping All Orders $49+

RP52221

Image-RP152

Delta®

Delta® Set Screw

List Price: $10.45
Online Price: $8.36
Free Ground Shipping All Orders $49+

RP152

4.20 5
Image-Master-RP60729

Delta®

Delta® Aerator - Water-Efficient - 0.5 GPM

List Price: $35.05
Online Price: $28.04
Free Ground Shipping All Orders $49+

RP60729

Image-RP71111

Delta®

Delta® Aerator - Water-Efficient & Wrench - 0.5 GPM

List Price: $53.60
Online Price: $42.88
Free Ground Shipping All Orders $49+

RP71111

Image-RP51503

Delta®

Delta® Bonnet Nut w/ Valve Seal

List Price: $35.10
Online Price: $28.08
Free Ground Shipping All Orders $49+

RP51503

5.00 3
Image-Master-RP52220

Delta®

Delta® Clear Knob Handle Kit

List Price: $37.65
Online Price: $30.12
Free Ground Shipping All Orders $49+

RP52220

Image-RP54899

Delta®

Delta® Spacers (4)

List Price: $14.00
Online Price: $11.20
Free Ground Shipping All Orders $49+

RP54899

* Actual pricing may vary and is determined by the selling retailer/wholesaler/dealer.