Delta 19978-DST, 9178-DST & 9678-DST Faucet Parts List

A comprehensive parts identification guide for Delta faucet models 19978-DST, 9178-DST, and 9678-DST, including exploded views and component reference numbers for maintenance and repair.

Table of contents

Quick guide from the manual

This document serves as an official parts identification guide for Delta faucet models 19978-DST, 9178-DST, and 9678-DST. It provides a detailed exploded view of the faucet assembly, allowing users to identify specific components for repair or replacement. When ordering parts, always specify the finish of your faucet.

Device components and assembly

The faucet assembly consists of several key subsystems:

Exploded view of faucet components and assembly parts

Handle and Valve: Includes the lever handle (RP63195), set screw (RP40650), cap (RP51502), bonnet (RP51503), and the main valve assembly (RP50587).
Sprayer and Hose: Features the ShieldSpray or standard sprayer assemblies (RP90841 or RP51480), including the hose, aerator, and wand retainer kit (RP80977).
Mounting Hardware: Includes the mounting bracket and nut (RP51685), trim ring, base and gasket (RP52610), and optional escutcheon plate (RP47274).
Connections: Includes adapters (RP63263) for 3/8-24 UNEF to 1/2-20 UN or 1/2-14 NPSM connections.
Dispenser: The soap dispenser assembly (RP50813) includes the pump and bottle (RP47888) and mounting nut (RP21945).

Maintenance and repair

For maintenance tasks, the following tools and components are referenced:

Aerator maintenance: Use the provided aerator wrench (RP50815 or RP90248) to remove and clean the aerator.
Hose replacement: The 62-inch hose assembly (RP62057) includes the necessary clip (RP60911) for secure attachment.
Weight adjustment: The steel weight assembly (RP49149) is used to ensure proper retraction of the sprayer hose.

Practical help

Common problems

Sprayer hose not retracting properly

Check the position and security of the steel weight assembly (RP49149) on the hose.

Low water flow from sprayer

Remove the aerator using the provided wrench (RP50815/RP90248) and clean out any mineral deposits or debris.

Before use

Identify your specific model number (19978-DST, 9178-DST, or 9678-DST).
Determine the finish of your faucet before ordering replacement parts.
Ensure you have the correct adapters (RP63263) if connecting to non-standard supply lines.
Verify if you are using the optional escutcheon plate (RP47274) for 3-hole sink installations.

Specs in practice

RP63263 Adapters: Converts 3/8-24 UNEF connections to either 1/2-20 UN or 1/2-14 NPSM standards.
RP62057 Hose: A 62-inch replacement hose assembly specifically designed for these pull-down models.

Images and diagrams

The exploded view shows the vertical stacking of the valve assembly, bonnet, and handle.
The diagram illustrates the connection path from the sprayer hose through the mounting bracket to the water supply.
The dispenser assembly is shown as a separate sub-component from the main faucet body.

Model compatibility

Parts are specific to the DST (Diamond Seal Technology) series.
Always specify the finish when ordering parts marked with a triangle symbol.

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Manual page author

Emily Carter

User documentation editor

Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.