I love this lily whistle, this is not an ADA product so the quality is probably lower but for the price it works great. You will need ⅝ vinyl tubing, which you can purchase at any hardware store. I've used both light wall ⅝ ID ¾ OD (ID and OD) and heavy wall ⅝ ID ⅞ OD tubing, and I name the thicker tubing because it looks more like clear tubing and stands straighter with our bends. A good tube is definitely worth the money.
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