Classic downstream valve. Esteemed for many years for its safe and reliable performance, due to its robust design and low maintenance.
多年来由于其坚固的设计和低维护，可靠的性能，使广大潜水爱好者用起来更安全。
Second check must be drip tight when pressure is applied to downstream side of valve.
当阀门下游一侧出现压力时，第二止回阀必须是无滴漏。
No matter how the valve is installed, the back of the upstream seat protects the face of the downstream seat.
无论阀门如何安装，上游阀座的后背都能够保护下游阀座的表面。
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