FORMUFIT F001CRX-BK-4 Cross PVC Fitting, Furniture Grade, 1" Size, Black (Pack of 4) Fits 1" Size PVC Pipe, which has an outside diameter of 1-5/16" (1.315") Superior, glossy black surface finish with tapered sockets for a Professional appearance Manufactured in the USA from durable and UV-resistant Furniture Grade PVC. Will not crack, change color or degrade over time like other sub-par PVC fittings.