Piston Ring Function Six major topics are presented in each of the booths (B1 ~ B6) in Exhibition Hall B. Please enter the B Hall here and select the booth of your interest. 1-6 Click on the booths you wish to visit. Piston & Piston Ring Assembly Basic Ring Function Ring Design Criteria Top Ring Second Ring Oil Ring Exhibit Hall B-1 Exhibit Hall A Piston Ring Museum Exhibit Hall A Engine Structure & Operation Exhibit Hall B Piston Ring Function B-1 Piston & Piston Ring Assembly B-2 Basic Ring Function B-3 Ring Design Criteria B-4 Top Ring B-5 Second Ring B-6 Oil Ring Exhibit Hall C Technologies that Assure Ring Function Exhibit Hall D Helping to Preserve the Environment