This is a nice old Aero Kool aluminum shank radiator briar bowl style pipe. This is a very hard to find pipe and is in mint restored condition. You pull out firmly and slowly on the bit to remove the inner shaft, in doing so pulling all of the gunk and residue out and cleaning the inside of the aluminum shank. HOW KOOL!!!
The aluminum body is very nice. This pipe has been polished to a mirror bright perfect finish!
There is no chatter or bite marks on the original bit/stem perfect vulcanite.
No buildup in the bowl, has been sanded inside to like new it seems to have had very little use. The outside has been rubbed with gloss tung oil. Beautiful grain!
Length: 5 3/8-inches. Bowl height: 1-13/16 inches. Bowl width: 1-3/8 inches. Chamber width: 7/8 inches. Depth: 1 inch
Hard to find these old aluminum pipes in this condition.
http://www.smokingmetal.co.uk/pipe.php?page=93 
An aluminum alloy stem and a vulcanite mouthpiece made in Seattle USA.  The imported briar bowl is attached by screw through the base of the chamber.  Stamped below the stem is either Spiral Kooler or Aero Kool, there is no difference in either model. I have an example with no stamping at all!!  Designed by Merrill G Sampson of the Aero Kool Pipe Company in Seattle. Initially the whole production went to the Armed Forces. They became more readily available in 1946 at $8.50. In 1946 the whole production was moved to a new facility at Santa Monica, California, losing only 3 days production time !  It was designed to meet the need of smokers who did not wish to have to be engineers to take their metal pipes apart to clean.  By the incorporation of a neoprene acid resistant gasket on the front end of the  integral mouthpiece/push rod, simply removing the mouthpiece cleans the shank at the same time. There should be an insulating fiber gasket between the bowl and shank.
In 1947 an Aero Kool Convertible was produced. More conventional, metal condensation principle via metal tube between stem and bit and conventionl filter insert
 
I'm a big fan of Kirsten pipes,  they are a great company and really good people, please look at their web site and support them when you can.
 
My metal estate (used) Pipes are lightly cleaned, and buffed (shanks and aluminum parts polished). The Buyer must clean and sanitize the pipe to their own standards before use. Unless otherwise stated estate pipes are used and may have minor use marks on the briar and minor marks on the stem.
 
Shipping: Will be shipped within 2 business days of payment. Item will be packed VERY carefully to assure it arrives in the same condition it is in now.
Please look at the other estate pipes I have offered. I will combine shipping if more than one pipe is purchased.