Graco 15C988 Gland Packing

The Graco 15C988 Gland Packing provides a reliable seal at the pump throat, preventing leaks and maintaining pump performance in Graco displacement pumps.

Fits Graco Ultra Max II 795, Mark V, and select fluid section pumps
OEM quality for long-lasting performance
Easy installation with standard V-packing rings
Ensures consistent pressure and leak-free operation

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Description

Graco 15C988 Gland Packing – Compatibility & Technical Details

The Graco 15C988 is a female throat gland packing used in Graco displacement pumps. It seals the piston rod at the pump cylinder throat, preventing fluid leaks and ensuring long-term hydraulic integrity.

Compatible Machines

Graco Ultra Max II 795 (Standard / Hi‑Boy) – found in its pump parts list.
Graco Mark V Pumps – documented in parts diagrams.
Graco displacement pumps using fluid sections 16X414 / 16X418.
Graco LineLazer V 3900 / 5900 series.

Specifications

Part Number	15C988
Type	Gland, Female, Throat
Function	Seals around the piston rod at the throat to prevent leaks
Material	Metal body (to hold V‑packing rings)
Included In	OEM Packing Repair Kit 248212
O‑Ring Compatibility	Uses PTFE O‑Ring (part 107079) per manual diagrams
Backup Washer	Uses 15C997 washer (per Graco schematic)
Maintenance Interval	Inspect whenever pump is rebuilt or when leaks are evident

Key Features

High‑quality sealing: Provides a durable seal at the pump throat to minimize fluid loss.
OEM‑grade component: Part of Graco’s original packing design for displacement pumps.
Compatible with standard V‑packing stacks: Built to house leather or UHMWPE rings.
Long-term reliability: Helps uphold pump performance under repeated cycles.

Installation Notes

During repacking, stack the 15C988 gland with the correct sequence of V‑packing rings (leather and/or UHMWPE) following Graco’s service manual.
Lubricate the packing lightly before inserting the gland to ease assembly and prevent damage.
Use the correct torque when tightening the packing nut to avoid distorting the gland or damaging the packing stack.
Make sure to install the PTFE O‑ring (107079) and backup washer (15C997) if required by your assembly.

Frequently Asked Questions

If this gland wears or cracks, fluid can leak around the piston rod, reducing system pressure, causing inefficient operation, and possibly damaging other packing components.

It is best to use the genuine Graco 15C988. Using non-OEM parts may result in inadequate sealing, faster wear, or potential compatibility issues with the O‑ring and backup washer.

You should inspect the gland each time you repack your pump or if you observe leaks, dropping pressure, or worn packing material. If it's visibly damaged or distorted, replace it.

Not particularly. If you follow Graco’s pump‑rebuild instructions—remove the nut, remove old packing, stack the new V‑packing and gland, then torque properly—the process is straightforward.