Watts Dual Check with Atmospheric Vent LFN9 3 8" Toilet Paper Batteries Required: No Batteries Required: No 26 (1999) and TMDL requirements{CAPTION} Sampling Port option (Part# 9271) allows use of the Ultra Universal Sampler (see page ) to test post treatment Dual Check with Atmospheric Vent Body Height: 2 3 8 in
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