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

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.)
• Graco **XM Plural-Component (PFP)** Sprayers
• Graco **XM70™** Plural Sprayer series
• Graco **XM50™** Plural Sprayer series

Technical Specifications

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