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Eliminates problems when evacuating closed tanks or piping systems. The one-way valve that is normally closed at positive pressure will allow drainage at a rate of 300 GPM. For higher drainage rates use additional vacuum breakers. The 3⁄4" NPT(F)socket adapts easily onto a 11⁄2" bulkhead fitting. The breaker is made of PVC with a Viton® seal.
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