The vacuum energy function can increase air pressure, increase pump expansion, and enhance the glass negative pressure

A: 23 * 4.4 cm internal diameter complete set A B: 23 * 5.1 cm internal diameter complete set B C: 23 * 5.7 cm internal diameter complete set C D: 23 * 6.4 cm internal diameter complete set D E: 31 * 4.4 cm internal diameter complete set E F: 31 * 5.1 cm internal diameter complete set F G: 31 * 5.7 cm internal diameter complete set G H: 31 * 6.4 cm internal diameter complete set H