REGO 3146S Back Check Valve – 3/4" NPT Brass LP Propane ValveThe REGO 3146S is a high-quality brass back check valve designed to provide one-direction flow protection in propane and LP gas systems. It is commonly used in bulk storage tank filling applications where preventing reverse flow is critical for safety.When paired with an appropriate single check filler valve, the 3146S forms a double check valve system, making it suitable for use in bulk propane installations.Key Features & Benefits:3/4" NPT inlet and outlet connectionsAutomatic back check design limits flow to one directionPrecision-machined brass constructionIdeal for bulk propane tank fill linesDesigned to protect container openings during filling operationsCommon Applications:Bulk propane storage tanksLP gas fill linesCommercial and industrial propane systemsBrand new, in stock, and ready for immediate shipment.