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Graco 121688 Connector 3/8" T x 3/8" NPT

A durable Graco connector for linking 3/8″ tube to 3/8″ NPT ports in XM plural-component sprayers. Ideal for secure, leak-resistant fluid routing.

  • Part #: 121688
  • 3/8″ NPT (F) × 3/8″ Tube (M)
  • Compatible with XM, XM50™, XM70™ & XM-OEM systems
  • Metal construction for high-pressure fluid lines

$24.16
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Graco 121688 | 3/8″ T × 3/8″ NPT Connector

This Graco 121688 connector is a compact, threaded fitting designed to link 3/8″ fluid tube to a 3/8″ NPT port — ideal for fluid control systems in Graco plural-component sprayers.

Compatible Machines

The 121688 connector is used in various Graco **XM Plural-Component** sprayer systems, including:

  • Graco **XM-OEM** Sprayers (e.g., XMEA, XMED, XMF, XMFD, etc.) :contentReference[oaicite:0]{index=0}
  • Graco **XM Plural-Component (PFP)** Sprayers :contentReference[oaicite:1]{index=1}
  • Graco **XM70™** Plural Sprayer series :contentReference[oaicite:2]{index=2}
  • Graco **XM50™** Plural Sprayer series :contentReference[oaicite:3]{index=3}

Technical Specifications

Part Number 121688
Connection A 3/8″ NPT (female)
Connection B 3/8″ Tube (male)
Material Metal connector (durable for fluid systems)
Application Fluid line in two-component spray systems (e.g. Graco XM)

Benefits & Use Cases

  • Enables secure fluid-line connections where 3/8″ tubing meets NPT ports
  • Used in high-precision plural-component systems for reliable fluid routing
  • Compact and robust, suited for tight installations inside pump/control modules

Installation Guidelines

  1. Ensure the NPT port and the 3/8″ tube are clean before connecting.
  2. Use a compatible thread sealant or PTFE tape on the NPT side to prevent leaks.
  3. Tighten by hand, then use a wrench — avoid over-torquing to prevent damage.
  4. After installation, perform a pressure test to verify there are no leaks.

Frequently Asked Questions

It links 3/8″ fluid tubing to a 3/8″ NPT thread, enabling fluid flow between the system’s components in Graco plural-component (XM) sprayers.

Yes — it appears as “121688 CONNECTOR, 3/8 npt × 3/8 tube” in the Graco XM OEM sprayer parts list. :contentReference[oaicite:4]{index=4}

Use a compatible thread sealant or PTFE (Teflon) tape rated for fluid systems. Make sure it’s safe for the fluids you’re using.

Yes, it’s designed for use in high-pressure plural-component systems like Graco XM sprayers. But always check your system’s maximum working pressure in the manual.

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