Delta Faucet RP31558SS Tub Drain - Replacement Tub Drain

In this review of the Delta Faucet RP31558SS Tub Drain the bottom line is simple: this is a straightforward replacement drain assembly for homeowners and DIYers who need a stainless steel stopper and waste plug that match Delta fixtures. The kit includes both the stopper assembly and the waste plug, and the most compelling reason to buy is the clear compatibility details - stopper screw threads of 5/16 in - 18 and a waste plug sized 1.5 in x 1 1/2 NPSM - which make it easy to confirm fit before purchase. The part is a basic, durable option intended for repair rather than upgrade.

Key Features

• Complete replacement kit: Includes both the stopper assembly and the waste plug so the drain is ready to install without sourcing extra parts.
• Clear thread sizing: Stopper screw threads are 5/16 in - 18, which helps identify compatibility with existing hardware before attempting installation.
• Standard waste plug: Waste plug is 1.5 in x 1 1/2 NPSM, fitting common tub drain openings designed for NPSM threading.
• Stainless finish: The stainless construction resists everyday corrosion and keeps the visible parts looking consistent with stainless fixtures.
• Manufacturer backing: Delta states faucets and parts are guaranteed for a lifetime, providing reassurance about availability and support when used as intended.

Who It's For

This drain is aimed at homeowners, handypersons and plumbers replacing a Delta-compatible tub drain or repairing a leaking or damaged stopper. People who already know the thread and plug specifications will find it quick to match and swap into their tub without buying an entire assembly.

Those seeking a decorative upgrade, a different style of stopper mechanism, or a nonstandard custom drain should look elsewhere; this product is a practical OEM-style replacement rather than a designer or universal multi-fit solution.

Pros & Cons

Pros

• Includes both stopper assembly and waste plug so the repair is complete in one part.
• Stainless construction offers a clean, durable finish that matches stainless fixtures.
• Explicit thread and plug sizes reduce guesswork about compatibility before purchase.

Cons

• Some users report inconsistent functionality or sealing, so expect to check fit and seal during installation.
• Not a universal fit; incorrect sizing will cause installation issues for nonmatching tubs.

Specifications

Our Verdict

The Delta Faucet RP31558SS Tub Drain is a sensible, value-oriented replacement for those who can confirm the thread and plug dimensions on their tub. It is good value because it contains both the stopper and waste plug and carries the reliability of an OEM part, though buyers should verify dimensions to avoid fit and seal issues during installation.

Frequently Asked Questions

Will this fit any tub drain?
It fits tubs that accept a 1.5 in x 1 1/2 NPSM waste plug and a stopper with 5/16 in - 18 screw threads; it is not universal.

Does the kit include everything needed?
Yes, the product includes both the stopper assembly and the waste plug so no additional parts are needed for a matching replacement.

Is there a warranty?
Delta states faucets and parts are guaranteed for a lifetime, which supports parts availability and service when used as intended.