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A ball valve (1/4" NPT) for drainage is included. It is commonly installed with a 5/8” OD sight glass (not included) to complete the assembly. 1 of 1/4" NPT Bronze Ball Valve for Drainage. DUCO® Bronze High Pressure ( 250 WSP ) Water Gauge Valve Set (Short-Shank), 1/2" MNPT.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.