PVC- Table cap 1" (Furniture Grade White) DO NOT use these fittings for plumbing projects. The Screw Tab Cap or table cap PVC fitting is useful any place you want to secure pipe to a surface. Three tabs with screw holes come out from the caps. 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. Furniture Grade means this fitting has a non-marked, glossy finish.