This PLAST-O-MATIC GY100V-PV Double Wall Sight 1? FNPT Poly is in good condition and is guaranteed to be functional with a 30-day return policy. This unit came from a local lab that had surplus lightly used equipment. We urge customers to view all photos as they show overall condition, included accessories and useful information. Listing only includes what is shown in photos. We will be happy to provide additional information as well as photos so please feel free to contact us with any questions. Advantages of Series GY Sight Glasses: Double-wall construction featuring Pyrex inner wall Large 360 viewing area. Full flow design (no corners to collect debris). Wide choice of select plastic materials to assure maximum chemical compatibility. Little or no maintenance required. No special hardware required for installation (completely assembled and pre-tested). Product Category Sight Flow Indicators Flow Indicator Style: Full View Connection Type Threaded Physical Characteristics Thread Size 1 inch (25.4 mm) Length (Face to Face) 5.25 inch (133 mm)