Graco 164672 Steel Adapter 3/8 in NPT to 1/4 in NPSM

The Graco 164672 Steel Adapter converts a 3/8 in NPT (Male) to a 1/4 in NPSM (Female) connection. Ideal for high-pressure airless paint sprayers up to 7250 psi.

OEM Graco steel construction for durability
Ensures secure, leak-free fitting between hose and pump
Compatible with Ultra Max II, Mark HD, and GMAX II models

Retail Price: $31.5

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Description

Key Details & Fitment

Compatible Machines

This Graco 164672 Steel Adapter (3/8 in NPT Male to 1/4 in NPSM Female) is used across many professional Graco airless units. Confirm against your machine’s parts list before ordering.

Ultra Max II 695 (Lo-Boy & Hi-Boy)
Ultra Max II 795
Ultra Max II 1095
Ultra Max II 1595
Mark IV HD 3-in-1 (Standard/ProContractor)
Mark V HD 3-in-1 (Standard/ProContractor)
Mark X HD 3-in-1 (Standard/ProContractor)
GMAX II 7900 (Gas, Hi-Boy)

Product Summary

Genuine OEM Graco adapter designed to connect components with different thread standards. Converts 3/8 in NPT (Male) to 1/4 in NPSM (Female), suitable for high-pressure airless paint sprayer applications up to 7250 psi.

Specifications

Attribute	Detail
Part Number	164672
Description	Steel Adapter — 3/8 in NPT (Male) to 1/4 in NPSM (Female)
Pressure Rating	7250 psi (typical for high-pressure airless systems)
Material	Steel
Application	Adapters/fittings for hoses, guns, manifolds, and pump outlets on Graco airless sprayers
OEM Status	Genuine Graco OEM
What’s Included	1 × Adapter 3/8 in NPT (M) to 1/4 in NPSM (F)

Fitment & Usage Notes

Commonly used where the pump/manifold has a 3/8 in NPT port and the hose/gun whip uses 1/4 in NPSM.
Always check sealing surfaces and use appropriate thread sealant on NPT threads (not on NPSM seats).
Verify the adapter’s location by referencing your sprayer’s parts manual or schematic.

Frequently Asked Questions

Yes—this adapter is used across multiple Ultra Max II sprayers (e.g., 695, 795, 1095, 1595) and other professional Graco machines like Mark IV/V/X HD and GMAX II 7900. Always verify against the specific series/variant parts list for your unit before purchase.

NPT is a tapered pipe thread that seals on the threads and typically needs sealant/tape. NPSM is a straight mechanical thread; it seals against a mating seat (not via thread taper). This adapter lets a 3/8 in NPT (Male) port interface with a 1/4 in NPSM (Female) connection used on many hoses/guns.

Apply pipe thread sealant (or PTFE tape per best practice) to the NPT side only. Do not apply sealant to NPSM seating surfaces; ensure the mating seat is clean and undamaged for a proper seal.

The adapter is commonly rated to approximately 7250 psi for airless applications. Always follow your sprayer’s maximum working pressure and the lowest-rated component in the circuit.