Skip to content
Free Local Pickup â—Ź Ship to Your Hometown Store
Pro & Contractor Accounts â—Ź Apply for Net Terms
100,000+ Products â—Ź Trusted American Hardware Brands

Danco Ballcock Coupling Nut Black Plastic

Restore a secure, leak-free connection to your toilet with the Danco Ballcock Coupling Nut in Black Plastic. Designed for practicality and reliability, this 1-inch diameter nut fit…

Danco MPN 51835B In Stock & Ready to Ship
Local Price Check i Local stores may price this as low as $2.99. Our online price is $2.99.
$2.99
Includes free shipping on orders over $75 · $8.99 standard below
Delivery in as little as 1–4 business days Order within for same-day shipping
Cases of 5 · Order in multiples of 5

Sold by the Case · Save 15%

Take $2.25 off your case at checkout

Case of 5 · List Price $14.95
15% OFF with code at checkout $12.70
Use Code at Checkout

This product is packed and shipped from our distribution network as a complete case of 5. Apply casediscount at checkout to take 15% off your order.

Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

About Product Overview

Restore a secure, leak-free connection to your toilet with the Danco Ballcock Coupling Nut in Black Plastic. Designed for practicality and reliability, this 1-inch diameter nut fits standard ballcock valve connections, delivering a dependable seal without the bulk of bulky metal parts.

Key details at a glance:

  • Diameter: 1 inch
  • Height: 3/8 inch
  • Material: Plastic
  • Color: Black
  • Product Type: Ballcock Coupling Nut
  • In Package: 1 piece
  • Handles Included: No
  • Hardware Included: No

This coupling nut is ideal for DIY repairs in residential bathrooms, offering a lightweight, corrosion-resistant alternative to metal nuts. Its plastic construction helps prevent thread galling and provides a forgiving fit that makes installation straightforward—even in tight spaces behind the toilet tank.

Who should consider this part? Homeowners and handy individuals looking to replace a worn or leaking ballcock nut without dealing with metal corrosion or complex hardware. If your toilet’s fill valve connection uses a standard 1-inch size, this nut is a compatible, cost-effective solution to restore performance quickly.

Why choose the Danco Ballcock Coupling Nut?

  • Reliable, simple fix for common ballcock valve connections
  • Plastic construction offers durability and ease of handling in damp bathroom environments
  • Low-profile design minimizes clearance issues behind the toilet
  • Economical replacement part that can save on service calls

Installation is straightforward: align the nut with the ballcock valve connection, hand-tighten until snug, then test for leaks by slowly restoring water supply. If you’re updating or servicing a toilet, this one-piece black plastic coupling nut provides a dependable, easy-to-use option that keeps your bathroom functioning smoothly.

The Details Specifications

Brand Danco
SKU 4080503
UPC 037155518357
Unit 0
Case Pack Quantity 100 per case
Retail Unit Quantity 5
Unit of Measure 0 0
Dimensions (L × W × H) 6 × 4 × 2
Weight 0 lbs
Cubic Feet 0.00319 ft³
Country of Origin TAIWAN
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare