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Comparison : Item # GYW150V-PV, 1-1/2 Inch (in) National Pipe Thread (NPT) Polyvinyl Chloride (PVC) Wafer Style Sight Glass with Fluorocarbon (FKM) Seal
Item # GYW200V-PV, 2 Inch (in) National Pipe Thread (NPT) Polyvinyl Chloride (PVC) Wafer Style Sight Glass with Fluorocarbon (FKM) Seal
Item # GYW300V-PV, 3 Inch (in) National Pipe Thread (NPT) Polyvinyl Chloride (PVC) Wafer Style Sight Glass with Fluorocarbon (FKM) Seal
Item # GYWX400V-PV, 4 Inch (in) National Pipe Thread (NPT) Polyvinyl Chloride (PVC) Wafer Style Sight Glass with Fluorocarbon (FKM) Seal
Item # GYWX600V-PV, 6 Inch (in) National Pipe Thread (NPT) Polyvinyl Chloride (PVC) Wafer Style Sight Glass with Fluorocarbon (FKM) Seal