SMC (6870090) 687 Series PVC NSF Check Valve ; 3/4"FNPT x 3/4"FNPT Buna Choose:Two Pack 0 to 10 GPM range

0 to 10 GPM range with dual measurement scales for easy reference during system operation and troubleshooting

Non-air gap design requires appropriate backflow prevention upstream if mandated by local codes

Handles up to 150 GPM with HC/170 style cartridges or 50 GPM with 1-micron absolute POLY-PLEAT filters for sediment and particulate removal

granular activated carbon (GAC)

} Water Sentinel WSL-1

SMC (6870090) 687 Series PVC NSF Check Valve ; 3/4"FNPT x 3/4"FNPT Buna Choose:Two Pack 0 to 10 GPM rangeSMC 687 Series 3 4" FNPT PVC Check Valve with Buna Seals Glass filled polypropylene construction with low 1 PSI cracking pressure for reliable one way flow control NSF Certified 125 PSI Max 17 GPM Flow Viton Seals The SMC 6870090 check valve prevents backflow in RO systems, booster pump installations, and pressurized water lines where maintaining directional flow is critical. Install downstream from your pump to eliminate water hammer and protect