Connect vent hose loosely to test cock #1. Open valve A to vent air from the vent hose. Tighten vent hose at test cock #1, open test cock #1.

• 将排气软管松弛地连接到测试旋塞1号。开启阀门A从排气软管处排出空气。紧固测试旋塞1号上的排气软管，开启测试旋塞1号。