Akron Brass Mid-X Medium [866] Expansion Foam Tube for 1 1/2'' Turbojet Nozzles. This foam tube is ideal for use in fire & vapor suppression applications with its wide range of expansion ratios. The Mid-X can produce a thick foam blanket with the nozzle pattern in a wide fog position or lower expansion foam providing better reach with the pattern in straight stream. The Mid-X attaches in a matter of seconds to many Akron Brass handline nozzles.