I'll have a look at the HW store...

It blows right at the T - where the formed piece attaches to the big hose (either at the top or bottom of the formed piece). The small attached hose goes to the overflow tank (dead end) and the big one is the main hose (seems to cool just fine, until it blows). I flushed it recently and everything seemed to flow ok then. I thought that the hose looked pretty good too.

I think that they blow because 1) the formed T design isn't ideal, and 2) lousy aftermarket parts.

From MBZ, this part is about $120. Fastlane has an Elaplast for around $75 which I'd expect is a quality part. All of the others are around $20 - $30 but apparently not worth even that. I like the metal T solution because it eliminates this as a failure point but I'll probably buy one from Fastlane or MBZ and then keep the T as a field service part for when the inevitable happens.

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Chris_87_300D
1987 300D - 415,000+ miles
1999 E320 - 220,000+ miles
2008 SL55
2019 Sprinter Diesel 4x4