As an added feature, the 1170-M2, L1170-M2 series incorporates integral check valves and filter washers in both the hot and cold water inlets to protect against cross flow.

• 作为额外的性能，1170-M2，L1170-M2系列在热水和冷水进口处整合了止回阀和过滤器垫圈，以保护交叉流动。