Nothing they're just not BP ; )
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Nothing they're just not BP ; )
OMG, my first loop used two of those on every connection to hold the tubes on. The design of the loop was so bad that the pressure was so high that without that the tubes would literally shoot off and without two of them water would spray out! Oh, the days of using 3 different tube sizes b/c I did not have the correct adapters for my pump...