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The SMC PNEUMATICS KQ2U03-99A is a push-to-connect Y-plug tube fitting designed for quick, tool-free connections in pneumatic plumbing systems. Constructed from brass and polybutylene, it accepts tubing with a 5/32 inch outside diameter and is rated for a maximum working pressure of 145 psi. The Y-plug configuration allows a single tube port to be capped or branched without disturbing the rest of the circuit. Pneumatic technicians and industrial maintenance professionals install this fitting in compressed-air lines, automation equipment, and fluid-handling assemblies where fast, repeatable connections are required.
This fitting is suited for both light industrial and commercial pneumatic applications. It is commonly installed in air-actuated control systems, manifold assemblies, and anywhere a 5/32 inch OD push-to-connect port needs to be plugged or extended. The fitting operates across a wide temperature range, from 23 degrees F to 140 degrees F, making it appropriate for indoor and moderate-environment installations. Its compact overall length of approximately 1.76 inches keeps panel and manifold layouts tight.
Designed as an OEM-style replacement or direct-install push-to-connect Y-plug fitting for pneumatic systems using 5/32 inch OD tubing rated to 145 psi.
Installation is performed by pneumatic or industrial maintenance technicians. Always depressurize and isolate the air supply before connecting or disconnecting push-to-connect fittings. Verify that tubing OD matches the fitting specification before insertion to ensure a proper seal. Follow applicable compressed-air system codes and equipment manufacturer guidelines during installation.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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