SMC (6870090) 687 Series PVC NSF Check Valve ; 3/4"FNPT x 3/4"FNPT Buna Choose:Two Pack Prevents air accumulation inside the

Prevents air accumulation inside the housing

shipped dry to ensure long shelf life and reliable startup performance

and algae growth through electrochemical processes that damage microbial cell walls

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 Prevents air accumulation inside theSMC 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