Parker PP6UC4 Push-to-connect Union Fitting 3/8x1/4

Product Description

The PARKER PP6UC4 is a push-to-connect tube-to-tube union fitting designed for quick, tool-free connections between two tubes of different outside diameters. This reducer union accepts 3/8 inch OD tubing on one end and 1/4 inch OD tubing on the other, allowing a direct inline transition without additional adapters. Constructed from polypropylene with a tan color finish, it is rated to 150 psi and suited for low-pressure fluid and pneumatic lines in HVAC, refrigeration, and general plumbing applications. Installation requires no tools beyond pushing the tubing into the fitting body to seat the internal collet.

This fitting is used in residential and light commercial settings where quick tube connections or field repairs are needed. Typical applications include condensate drain lines, low-pressure water supply connections, and control tubing runs where a reducer union is required to transition between two tube sizes. The polypropylene body resists corrosion and is compatible with a range of non-aggressive fluids and gases. HVAC technicians, plumbers, and fluid-systems technicians routinely use push-to-connect fittings like the PP6UC4 to speed up installations and service calls.

Key Features

• Push-to-connect design allows tool-free tube insertion and fast field assembly
• Reduces from 3/8 inch OD to 1/4 inch OD in a single inline union body
• Polypropylene construction provides corrosion resistance for fluid and pneumatic service
• Rated to 150 psi for use in low-pressure systems
• Tan color finish for easy identification in multi-line installations

Compatibility

Designed as an OEM-style push-to-connect union replacement for low-pressure tube systems requiring a 3/8 inch to 1/4 inch OD transition in residential and light commercial applications.

Installation Notes

Installation is performed by cutting tubing squarely, deburring the cut end, and inserting each tube fully into the fitting until it seats against the internal stop. Shut off system pressure and relieve any residual line pressure before removing an existing fitting. To release tubing, depress the collet ring while pulling the tube free. Verify the rated working pressure of the system does not exceed the 150 psi fitting rating before placing in service.