This part is a (2) Hot Tub Spa Old Style Manifolds glued together that is 1 1/2" Slip on one end and 1 1/2" Street on the other end with a dead end knock out.. In other words the Street end has a blocked off plug that can be knocked out to make this a flow through.. It features (12) 1/2" total ports total that you would glue a 1/2" pipe in to which would measure about 3/4" outside Diameter. This part used in a lot of older tubs where 1/2" soft pipe glues inside the ports and goes to the back of each jet in the tub and is plumbed into 1 1/2" pipe which would measure about 1 7/8" outside diameter.

These are New Old Stock so they will not be aesthetically perfect but will have no issues working and they are glued together so they will gave non perfect glue menaing there can be some random blue glue on the body.