Tubing may depend on which nebulizer compressor and cups you have. Have you researched the exact tubing that goes with your system?

If you contact Just Nebulizers, they are very helpful in determining what will work for you. Most tubing (which is a standard size) works with most nebulizers and compressors. The ends may be slightly different, but in 40 years with compressors and a huge variety of nebulizer cups, I have never encountered tubing that wouldn't work.

I usually have purchased my tubing in combination with the nebulizers, and changed them out together every 2-3 months. After many rounds of sterilizing, the plastic neb cups themselves can begin to tiny little cracks and crevices, so throw them out.