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Graco 166209 Restrictor Nut

The Graco 166209 Nut, Restrictor secures the restrictor within the housing to maintain correct flow and pressure balance in the system. It’s used in back-pressure and circulation assemblies.

  • Part Number: 166209
  • Used in Restrict-A-Flo and manifold restrictor housings
  • Ensures leak-free, stable flow control
  • Always verify by parts manual before replacement

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Key Details & Fitment Guide

Graco 166209 Nut, Restrictor

Compatible Machines

This part is assembly-specific (restrictor housing / back-pressure valve) rather than tied to a single sprayer model. Verify by parts breakdown before ordering.

  • Graco Restrict-A-Flo Back Pressure Valve — Model 206-115 (Series B)
  • Graco restrictor housing assemblies that list 166209 “Nut, Restrictor” with 166206 (Housing) and 166208 (Restrictor)
  • Graco circulating / manifold systems using Restrict-A-Flo style back-pressure control

Overview

The Graco 166209 Nut, Restrictor secures the restrictor element inside its housing in back-pressure/control manifolds. Correct seating and torque are essential to maintain flow control and sealing within the assembly.

At-a-Glance Specs

Part Number 166209
Component Name Nut, Restrictor
Assembly Group Restrict-A-Flo Back Pressure Valve / Restrictor Housing
Related Parts (same assembly) 166206 Housing, 166207 O-Ring (PTFE), 166208 Restrictor, 166210 Control Rod
Typical Use Locks the restrictor in position to control return-line back pressure and flow in circulating systems

Fitment & Ordering Tips

  • Match by part number from your unit’s parts manual; do not substitute by appearance.
  • Inspect the restrictor and housing for wear; replace the PTFE O-ring when installing a new nut.
  • Relieve system pressure before service; tighten to the torque specified in your equipment manual.

Frequently Asked Questions

It retains and positions the restrictor inside the housing so the valve can maintain the set back-pressure/flow. If the nut loosens or is damaged, the system can lose control or leak.

No. It appears in parts breakdowns for Restrict-A-Flo–type back-pressure valves and related restrictor housings. Always confirm your assembly’s exact part list before ordering.

Inspect/replace the PTFE O-ring, check the restrictor surface, and verify the control rod and packing components for wear. Re-torque per manual after reassembly.

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