The International Trade Commission issued questionnaires for the final phase of its antidumping and countervailing duty investigation of common alloy aluminum sheet from China.

The National Marine Manufacturers Association is asking industry stakeholders that use aluminum sheet to submit responses.

“Responding is incredibly important to the case and overturning the 120 percent tariff on aluminum sheet, which was recently reduced from 200 percent,” the NMMA said in a statement.

The NMMA will host a webinar Aug. 15 from 11 a.m. to noon (E.T.) to walk through the ITC’s questions and how to answer them accordingly.

Register for the webinar here.

Though China is the largest supplier of aluminum sheet to the United States, most U.S. boatbuilders source their aluminum sheet in America, according to the NMMA.

However, there isn’t enough supply to meet demand, so smaller manufacturers sometimes source outside the United States.

Responses to the ITC questionnaires are due Aug. 31.