Graco 15R978 Adapter Pump Lower 75cc 3.5in

The **Graco 15R978 Adapter** enhances your sprayer’s fluid capacity with a 75 cc lower-section setup for higher output.

75 cc fluid displacement
Built for 3.5″ lower section
Stainless steel construction
Stability and reliability in high-demand applications

$166.46

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Description

Graco 15R978 Adapter Pump Lower – 75 cc, 3.5″ for Enhanced Fluid Output

Compatible Machines

Graco 75 cc lower-section pump sprayers
Modular high-output airless sprayers using a 3.5″ lower assembly
Professional systems requiring increased fluid capacity and longer stroke

The **Graco 15R978 Adapter** allows your sprayer to upgrade or maintain a 75 cc displacement lower pump section. Its precision-machined construction supports stable, high-volume fluid delivery for demanding applications.

Key Features

Part Number	15R978
Displacement Volume	75 cc
Length of Lower Section	3.5 in
Material	Stainless steel, precision-machined internals
Intended Use	High-capacity, industrial spray systems

Installation & Usage Tips

Shut off fluid and air supply before disassembling the lower pump.
Align coupling carefully to prevent cross-threading.
Use a torque wrench and tighten to recommended torque to secure the adapter.
After installation, run several pump cycles to verify there are no leaks and the flow is stable.
Inspect periodically and clean during maintenance to avoid buildup inside the fluid path.

Frequently Asked Questions

Yes — by coupling to a 75 cc lower section, it increases the displacement per pump cycle, enabling higher fluid output.

Yes — the stainless-steel construction and seal design support a wide range of coatings including solvent-based types.

It is specifically designed for 3.5″ lower assemblies; using it with other lengths may lead to misalignment or poor sealing.

Inspect when doing major maintenance or after heavy use — check for any signs of leakage, thread wear, or material fatigue.

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Graco 15R978 Adapter Pump Lower 75cc 3.5in

Graco 15R978 Adapter Pump Lower – 75 cc, 3.5″ for Enhanced Fluid Output

Compatible Machines

Key Features

Installation & Usage Tips

Frequently Asked Questions

ADDRESS

INFORMATION

YOUR ACCOUNT

Graco 15R978 Adapter Pump Lower 75cc 3.5in

Graco 15R978 Adapter Pump Lower – 75 cc, 3.5″ for Enhanced Fluid Output

Compatible Machines

Key Features

Installation & Usage Tips

Frequently Asked Questions

Does this adapter increase the fluid output?

Is this part suitable for solvent-based coatings?

Can I use this adapter on a lower that is not 3.5″ long?

How often should I inspect this adapter?

ADDRESS

INFORMATION

YOUR ACCOUNT