N365086

U.S. Department of Homeland Security U.S. Customs and Border Protection National Commodity Specialist Division One World Trade Center, Suite 51.201 New York, NY 10007 U.S. Customs and Border Protection N365086 September 24, 2026 CLA-2-84:OT:RR:NC:N1:104 CATEGORY: Classification TARIFF NO.: 8479.89.9597 Matthew Cussans FOCUS Business Solutions 6995 Monroe Blvd Taylor, MI 48180 RE: The tariff classification of diaphragm expansion tanks from Taiwan Dear Mr. Cussans: In your letter dated September 15, 2026, you requested a tariff classification ruling. The products in question are Hydrapro thermal expansion tanks, models HPTET2 (2 gallon) and HPTET45 (4.5 gallon). The expansion tanks are constructed of a welded steel shell and installed near a water heater to absorb thermally expanded heated water. This allows a place for the heated water to expand out of the water heater and not exert undue pressure within the potable water plumbing system. The expansion tanks consists of two chambers separated by a rubber diaphragm. Water enters on one side of the diaphragm while air is on the other. As water is heated in the water heater tank, the water expands, creating pressure. The hot water then travels to the thermal expansion tank to be temporarily held. This helps alleviate pressure build up in the potable water plumbing system. The water presses on the diaphragm, compressing the air. When water cools and the water pressure drops, the air pressure pushes on the diaphragm, mechanically forcing the water back into the plumbing system to be used. The applicable subheading for the diaphragm expansion tanks, models HPTET2 and HPTET45, will be 8479.89.9597, Harmonized Tariff Schedule of the United States (HTSUS), which provides for machines and mechanical appliances having individual functions, not specified or included elsewhere in this chapter; parts thereof: other machines and mechanical appliances: other: other: other. The general rate of duty will be 2.5 percent ad valorem. The duties cited above are current as of this ruling’s issuance. Duty rates are provided for your convenience and are subject to change. The text of the most recent HTSUS and the accompanying duty rates are provided at https://hts.usitc.gov/. This ruling does not address the applicability of any additional duties, taxes, fees, exactions and/or other charges, which may apply to the goods discussed herein. This includes, but is not limited to, tariffs and other duties as provided for in Subchapter III to Chapter 99, HTSUS. Thus, for example, in addition to the classification stated above, the merchandise covered by this ruling may also need to be reported with either the Chapter 99 provision under which an additional tariff applies or one of the Chapter 99 provisions covering exceptions to such tariffs. For further information to assist with the importation process, please refer to the frequently updated Cargo Systems Messaging Service (CSMS) messages at https://www.cbp.gov/trade/automated/cargo-systems-messaging-service and the Trade Remedies page at https://www.cbp.gov/trade/programs-administration/trade-remedies. The holding set forth above applies only to the specific factual situation and merchandise description as identified in the ruling request. This position is clearly set forth in Title 19, Code of Federal Regulations (CFR), Section 177.9(b)(1). This section states that a ruling letter is issued on the assumption that all of the information furnished in the ruling letter, whether directly, by reference, or by implication, is accurate and complete in every material respect. In the event that the facts are modified in any way, or if the goods do not conform to these facts at time of importation, you should bring this to the attention of U.S. Customs and Border Protection (CBP) and submit a request for a new ruling in accordance with 19 CFR 177.2. Additionally, we note that the material facts described in the foregoing ruling may be subject to periodic verification by CBP. This ruling is being issued under the provisions of Part 177 of the Customs and Border Protection Regulations (19 C.F.R. 177). A copy of the ruling or the control number indicated above should be provided with the entry documents filed at the time this merchandise is imported. If you have any questions regarding the ruling, please contact National Import Specialist Arthur Purcell at arthur.purcell@cbp.dhs.gov. Sincerely, (for) James P. Forkan Director National Commodity Specialist Division

set forth above applies only to the specific factual situation and merchandise description as identified in the ruling request. This position is clearly set forth in Title 19, Code of Federal Regulations (CFR), Section 177.9(b)(1). This section states that a ruling letter is issued on the assumption that all of the information furnished in the ruling letter, whether directly, by reference, or by implication, is accurate and complete in every material respect. In the event that the facts are modified in any way, or if the goods do not conform to these facts at time of importation, you should bring this to the attention of U.S. Customs and Border Protection (CBP) and submit a request for a new ruling in accordance with 19 CFR 177.2. Additionally, we note that the material facts described in the foregoing ruling may be subject to periodic verification by CBP. This ruling is being issued under the provisions of Part 177 of the Customs and Border Protection Regulations (19 C.F.R. 177). A copy of the ruling or the control number indicated above should be provided with the entry documents filed at the time this merchandise is imported. If you have any questions regarding the ruling, please contact National Import Specialist Arthur Purcell at arthur.purcell@cbp.dhs.gov. Sincerely, (for) James P. Forkan Director National Commodity Specialist Division