9902.11.80 - Insulated tubes of plastics, not reinforced, without fittings, presented in the form of hose, the foregoing tubes having polyethylene pipes inserted therein and suitable for use in hot water supply or heating systems (provided for in subheading 3917.32.00)

This HTS classification, 9902.11.80, covers specialized insulated tubes designed for specific plumbing applications. Specifically, it applies to hoses made from plastics, which are not reinforced and do not have pre-attached fittings. A key distinguishing feature is the presence of an inserted polyethylene pipe, making these tubes suitable for use within hot water supply or heating systems. The provision for this HTS code also clarifies its relationship to subheading 3917.32.00, indicating that while the primary material and construction might fall under chapter 39, this specific configuration for heating systems is subject to temporary legislation within chapter 99.

As a leaf node within the HTS structure, this category does not have further subdivisions. Its specificity is crucial for distinguishing it from other plastic tubing or hoses that may lack the integrated polyethylene pipe, are intended for different fluid temperatures, or are designed for other purposes such as cold water lines or general fluid transport. The "insulated" aspect, combined with the internal polyethylene pipe and suitability for hot water or heating, are the critical criteria for classification under this code.