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Originally Posted by nikhsub1
Be wary of the R-1000... I had to remove it from my loop, it was too soft. It is great and makes great bends, but it will collapse on itself at the lnlet of the pump. Now it may not with the MCP350, but with my 3 D4's in series it did, and was a problem.
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Was that collapsing with the 3/4" inlet D4?
Can't say I've had a problem with R1000 (1/2" ID - 1/8" wall) on an Aquaxtreme pump (5/8" OD barb).
However the barbs used are somewhat tapered and so it would be difficult to see how the tubing could collapse (being that the point where the tubing is most stretched is further back on the barb).
On the other hand the D4's native barb has no flare save for a retaining lip around the edge which I can imagine might cause the problem you've described (the tubing is most stretched right at the edge of the barb - I can see that the tubing might compensate for this by curving inwards just prior to the lip and/or because the now thinner tubing in the distended area has no support within it's inner diameter).
The MCP350 should be ok though, it's native barb is more reminiscent of a tapered lip screw-on one.