This is another thread about materials, after finally realizing in the last couple years that the quality of materials, or lack of it, has been the bane of my MYOG existence; and surprisingly, a much bigger challenge than design or construction.
After spending too much time ordering and trying kite fittings, it dawned that there must be something better. Thanks to Daryl Clark for pointing in the direction of the plumbing department.
The little plastic barbed ones are a harder plastic material compared to rubbery kite Tees, and appear to come at least in nylon and polyethelene, immediately raising some preliminary questions: Which is stronger? Which is more bondable to annodized ALU? What are the best adhesives to bond with? Any answers from those in the know will be very much appreciated.
There are the hose/tubing barb Tees, and the Pex ones (the plastic, not the brass). The barbs are not important, because it is the inner diameter of the T that connects to the tube. (See Daryl's photos of his pack frame on this forum) The tubing ones are available in both nylon and polyethylene, but could not find at sharkbite.com the name of the plastic used on the black Pex ones.
All of them can be readily adapted to work as T fittings on ultra light pack frames or the like. The half-inch size polyethylene are available with an ID of 3/8", and the nylon with a little smaller ID that tightens as the tube insert approaches the T joint, and thus require a little drilling out to get a consistent ID. The Pex half-inch size come with a consistent ID around .312" that fits Easton fly tube, for example.
Particularly on the nonPex ones, the Tees can be cut back a bit. All of them are much lighter in weight than the heavier, rubbery kite Tees, and at least appear to be much stronger. Drilling or boring out greatly weakened the kite Tees, and will be avoided as much as possible with the plumbing ones.
The kite Tees will still be useful for angling the tubing, with 30, 45 and 60 degree fittings available. But the small 60 degree ones often split, and were unreliable. Only the heavier ones were at all reliable. But for 90 degree applications, the plumbing Tees will be used unless and until they prove no stronger than the heavier, rubbery kite Tees, which I doubt very much will be the case.
Another small step on the way to a much lighter pack frame. YES!

