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Graco 165198 Reducing Nipple Fitting

Graco 165198 Reducing Nipple Fitting adapts 3/8" (M) NPT to 1/4" (M) NPT for reliable high-pressure fluid-line connections. Verify against your model’s parts manual.

  • Thread: 3/8" (M) NPT × 1/4" (M) NPT
  • Style: Male × Male, hex nipple
  • Use: Hose/manifold size transition
  • Fitment: Select Xtreme, XP, XM systems (check manual)
  • OEM quality for leak-tight sealing

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Installation & Specs for OEM Reducing Nipple

Compatible Machines

  • Graco Xtreme® plural-component sprayers (select models that use a 3/8" M NPT → 1/4" M NPT reducer)
  • Graco XP™ plural-component sprayers (select models)
  • Graco XM™ plural-component sprayers (select models)
  • Other Graco high-pressure rigs where the parts manual specifies 165198 or the fluid line requires this thread transition

Part Details

Graco 165198 — Fitting, Nipple, Reducing. Male-to-male hex nipple used to adapt fluid lines from larger to smaller NPT sizes for leak-tight, high-pressure connections.

Attribute Value
Thread/Size 3/8" (M) NPT × 1/4" (M) NPT
Ends / Style Male × Male, Hex Reducing Nipple
Use Case Adapts fluid/paint hose or rigid pipe between 3/8" and 1/4" NPT in high-pressure systems
Genuine Part OEM listed for Graco systems; verify against model manual

Fitment & Installation Tips

  • Match both ends exactly: 3/8" (male) NPT to 1/4" (male) NPT.
  • Use only sealants approved for high-pressure paint systems; avoid over-application.
  • Do not mix NPT with BSPP/BSPT; thread forms and sealing methods differ.
  • Confirm component pressure rating meets or exceeds your sprayer’s maximum working pressure.

Frequently Asked Questions

It fits only if your parts manual calls out 165198 or your fluid line specifically transitions from 3/8" (M) NPT to 1/4" (M) NPT using a male-to-male reducer. Many consumer units use different adapters—check the manual before purchase.

Use fittings whose maximum working pressure is at least equal to (preferably higher than) your sprayer’s rated pressure. When in doubt, consult the model’s technical data and select OEM-specified components only.

Yes—use PTFE tape or an approved paste suitable for NPT threads and the coating being sprayed. Apply sparingly to avoid contaminating the fluid path.

A reducing nipple is male × male and often used inline; a reducer bushing is male × female and typically threads into a female port. Choose the style your manifold or hose routing requires.

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