Penn Radiant Products
Penn Radiant Products
Mailing:
PO Box 1354
Wexford PA 15090
Shipping:
8105 Perry Highway
Pittsburgh PA 15237
Toll-Free Phone: 1-800-438-2503
Fax: 412-635-8016
customerservice@pennradiant.com
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Formerly,  the firing & exhaust tube each had respective part numbers.  Currently the factory is using one part number for both the firing & exhaust  replacement tubes. 
 
OLD  CB/ Coldblocker replacement tubes:

#44028130   7 1/2'  FIRING  ALC tube w/ one 3-hole flange, 3" OD

#44028131    7 1/2' Exhaust ALC tube w/ one 6-hole flange, 3" OD

PART #44028132 is current part.

Specifications

Manufacturer

 N/A Space Ray

Used On

 N/A CB20, CB30, CB40 & CB50

Tube Specs

 N/A 7ft 6" x 3" dia w/ one 3-hole flange

Type

 N/A Firing/ burner & exhaust tube- ALC