PVC Adjustable joint fitting 1" (Furniture Grade White) DO NOT use these fittings for plumbing projects. 2-Way Adjustable Fittings allow for creating a desired angle along the same plane. Many applications include greenhouse ridges, adjustable arms on props, and custom angled frames. This fitting is adjusted by tightening and loosening a bolt which is located at the joint. There are special ridges on the mated surfaces of thearms which allow for a immovable joint once the bolt is tightened.? 1" Fittings fit on 1" Schedule 40 PVC or Furniture Grade PVC. Please check out ourPVC Sizing Guide (Specification Sheet)to make sure that you order the correct size PVC Fittings. PVC is NOT measured by the outside diameter, and doing so will result in receiving fittings that are too big for your pipe.