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RadiantPEX-AL

 Connections -   

Press

Insulator Washer*

Stainless Steel Press Sleeve

EPDM O-Rings

View Port

Brass

IS-WR-RadiantPEX-AL-Connections

For Residential or Commercial Radiant Heating and Snow Melt Applications

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RadiantPEX-AL press fittings include o-rings on the barbed section of the fitting 

and an insulator washer at the base. The stainless sleeve includes a view 

port for ensuring the RadiantPEX-AL is properly seated before making a press 

connection.

WARNING

!

Read these instructions and all product labels BEFORE 

installation. Installation must be performed by qualified 

personnel, in accordance with local codes and standards.
FAILURE TO COMPLY WITH PROPER INSTALLATION IN-

STRUCTIONS COULD DAMAGE TUBING AND FITTINGS CAUSING WATER 

DAMAGE AND/OR DAMAGE TO THE PIPING SYSTEM WHICH CAN RESULT 

IN PROPERTY DAMAGE AND/OR PERSONAL INJURY

WARNING:

 This product contains chemicals known to the 

State of California to cause cancer and birth defects or 

other reproductive harm.

For more information: Watts.com/prop65

Installation

1.   Cut the Tubing. Use a tubing cutter. Ensure the cut is straight and 

clean.

2.  Prepare the connection

•   Use a reamer tool to prepare the end of the tubing for the connection.
•   Ensure the insulator washer is in place at the base of the fitting.
•   Ensure the stainless steel sleeve is seated against the insulator washer.
•   Slide the RadiantPEX-AL tubing over the barb until it is fully inside the 

sleeve and can be seen through the view port.

3. Make the connection

•  Place the assembly contained by the sleeve into the press tool jaws.
•   Firmly close the jaws. The tool will automatically stop when complete.

4. Pressure Test

Test all connections between 50 to 100 psi (3.4 to 6.9 bar) with either air or 

water (do not use both). If temperatures are near or below freezing, do not  

use water.

O-rings and insulator must be re-installed before tubing is installed and 

the connection finalized.

Refer to Watts Radiant's Product Catalog for connection and tool options.

RadiantPEX-AL

Press & Compression Connections

NOTICE

•   Only use Watts Radiant fittings that correspond to the selected size and 

type of tubing. Improper sizing can result in leaks.

•   Wrap completed connections with PVC electricians tape or shrink wrap if 

they will be buried in concrete or other masonry material.

•   For sweat fittings, remove o-rings and insulator washer before soldering. 

Once cool, be sure to re-install.

•   Do not splice multiple lengths of RadiantPEX-AL tubing together as this will 

result in increased pressure drops. Refer to the tubing installation manual 

available from WattsRadiant.com for recommended circuit lengths and 

other tubing installation guidelines.

•   Repairing RadiantPEX-AL that has been in service requires special atten-

tion, particularly when glycol has been used. Any residual amounts of 

glycol or any other coating or debris inside the tube must be removed and 

all fitting surfaces must be clean before making connections.

•   Watts RadiantPEX-AL fittings are engineered to work together. Watts 

extends no warranty – express or implied – to any failure or damage of any 

kind resulting from the use of materials not specified by Watts. 

RadiantPEX-AL

 Connections -  

Compression

RadiantPEX-AL compression fittings include o-rings on the barbed section and 

an internal compression ring with an external compression nut.

Compression Ring

EPDM O-Rings

Compression Nut

Insulator Washer

Brass

Male NPT Adapter*

Installation

1.   Cut the Tubing. Use a tubing cutter. Ensure the cut is straight and 

clean.

2. Make the connection

•   Use a reamer tool to prepare the end of the tubing for the connection.
•  Slide the compression nut over the tubing.
•  Slide the compression ring over the tubing.
•  Ensure the insulator washer is in place in the recess of the fitting.
•   Slide the RadiantPEX-AL tubing over the barb. Make sure the tubing is 

seated against the insulator washer insert.

•   Slide the compression nut up and begin threading it onto the fitting. The 

compression ring will automatically be positioned as you tighten the nut..

•   Use an open-end wrench to complete the connection (do not use a  

crescent wrench). Tighten the connection to 20 in/lb (2.3 N-M) (snug and 

then an additional 1/4 turn).

3. Pressure Test

Test all connections between 50 to 100 psi (3.4 to 6.9 bar) with either air or 

water (do not use both). If temperatures are near or below freezing, do not 

use water.

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