Tubing for BRS 1.1ml pump keeps splitting

[glb]

I have two BRS 1.1ml dosing pumps for alk and ca. I used the tubing that came with them and for the most part they work well. But the tubing on my alk pump keeps splitting where it screws into the pump, causing the pump to lose the syphon. This keeps happening on the intake side only. The other tubing has always worked fine. Has anyone had this issue and come up with a solution? Here’s a pic of what I’m talking about:

 

[blaxsun]

I'm sensing an image...

 

[glb]

I'm sensing an image...

There you go! There was a glitch when I tried to post before. This is the only tubing that splits under the screw.

 

[glb]

Bump. The tubing on the input side of the alk pump keeps splitting where it attaches to the pump. This is the only connection where this happens. Maybe @ReefSquad can help?? Thanks!!