The manual shows a three-inch-diameter rubber ring, but I dont have it.
使用手册上说有一个直径三吋的橡胶圈，但我的没有。
2
The pump connects to a 33-foot-long, four-inch-diameter polyester-and-rubber hose.
水泵连接了一条长 33 英尺、直径为 4 英寸的聚酯胶管。
3
These are 12-inch-diameter tubes that have been inflated, bent to the proper shape and stiffened with a plastic resin, then installed side by side and stuffed with concrete, like giant manicotti.