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Graco 166215 Nut Packing

Graco 166215 Nut, Packing secures and compresses the pump’s packing stack to maintain a proper fluid seal. Use when servicing packings or if the nut’s threads are worn—always verify fit in your sprayer’s parts manual.

  • OEM replacement for pump lower/throat assembly
  • Prevents leakage by maintaining packing compression
  • Match by model & pump diagram before ordering
  • Install hand-tight first; avoid over-compression

$236.73
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Overview & Key Details

Compatible Machines

Compatibility for Graco 166215 Nut, Packing depends on the pump assembly. Always confirm via your sprayer’s parts manual or pump breakdown before ordering.

  • Graco Ultra / Ultra Max II contractor-grade piston-pump sprayers (selected models)
  • Graco Mark-series high-output texture/paint sprayers (selected models)
  • Graco LineLazer and TexSpray industrial-duty units using compatible pump stacks (selected models)

What This Part Does

The packing nut retains and compresses the pump’s packing stack around the piston/rod, maintaining a fluid seal, controlling leakage, and ensuring smooth pump operation. It is replaced when threads are damaged, adjustment runs out, or after major packing service.

Quick Facts

Part Number 166215
Part Type Packing Nut (pump/throat assembly component)
Typical Location Pump lower – secures/adjusts the packing stack on the piston/rod
When to Replace After packing overhaul, visible thread damage, or inability to maintain seal without over-tightening

Fit & Identification Tips

  • Match by model number and pump assembly drawing; confirm the packing stack and nut reference numbers in the manual.
  • Do not substitute by size/appearance alone—different Graco pumps use different nut geometries and threads.
  • On reassembly, tighten only enough to stop seepage; over-compression shortens packing life.

Frequently Asked Questions

Open your sprayer’s parts manual, locate the pump lower assembly diagram, and confirm the packing-nut reference number equals 166215. If unsure, cross-check your sprayer’s full model/series and serial range against the official parts list.

Clean threads, lightly lubricate per manual, and hand-start to avoid cross-threading. Tighten gradually until seepage stops during test spray. Recheck after first use—new packings may settle and need a minor readjustment.

Reuse is acceptable only if threads and sealing faces are undamaged. Many techs replace the nut whenever doing a full packing rebuild to ensure proper adjustment range and reliability.

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