I had mentioned this at the SystemCooling thread ...
"[Lee] As you had pointed out the plastic cover fittings having thinned walled sections, the injection molding die is steel safe, so updating the wall with a large radius would be ideal and at a minimal cost to do."
I would hope that the thin walled area would be beefed up with a radius.
Sure, pressing on/off tubing and hitting it with an impact testing hammer would show the part is strong without the added radius. HOWEVER, since all tubing is not the same, nor the same ID size, the press on efforts would vary.
The tubing, being secured onto the not radius fittings, when clamped down can route at various angles. Stresses over time would weaken this thinned wall area. Why do I mention this? Some types of tubing will soften with tempatures rising in the cooling loop and then reset when cooled.
Another issue with the thinned out fitting without radius, the coolant over delta-T (time) and delta-P (pressure) would permeate into the plastic and weaken this thin section as well. As overclockers, there are various coolants to be had on the market. Even the DIY coolants from the kitchen and garage.
A thinned wall section would be a high risk if the product is released that way.
Not too long ago, the ThermalTake BigWater pump/reservoir combo ran into a problem with bad fittings. People assembled the kit and it ran fine for a time. Then, without notice, the fitting let loose from the joint of the housing. Don't worry, the BigWater has an improved pump with blue LED now.
Stev