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I've been having problems with my service. sorry that I couldnt get back sooner. I will take a pic of the different kinds of hoses that I'm reffering to but you can tell what i mean by doing a simple test. take a straw, put it in your mouth and cover the other end with your finger. when you try to suck the air in the straw out, you will see the straw constrict and begin to close up. its because the straw is to thin to with stand the suction. need to use a hose with thicker layers. doesnt matter the brand, just the size of the holes.