Ultimately, replacing tubing is most suitable suggestion I'm afraid... and I'd heartily recommend Steel-reinforced tubing... which has a steel spring built within the sidewall (not on the interior or exterior...)
tis luverly and cheap... and rated for hi-vacuum applications... so won't collapse due to negative pressure...
http://store.over-clock.com/Tubing.html#a361
Available in 3/8" ID (shortly) or 1/2" ID.
Quote:
Temperature range: - 10°C + 60°C, + 14 F ÷ +140F.
Features:
* Pvc hose with a steel spiral reinforcement.
* Inside and outside smooth.
* Very flexible, resistant to atmospherical agents and most chemicals.
Applications:
* Particularly indicated for suction and delivery of liquids.
* Suitable for suction and delivery of alimentary liquids
* Meets the European directive 90/128/CEE class A, B and C
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S'slowly becoming a best-seller for us... less faff than cool-sleeves... and cheaper than tubing + coolsleeves.