These Acrylic Covers are for strainers with a center vent that were built prior to 2015, or have Serial Numbers <12467. The covers are made from cast, transparent acrylic and shipped with protective masking.  Be sure to peel masking off prior to use.
Part Numbers include: 1-030-5105A, 1-040-5105A, 1-060-5105A, 1-080-5105A, 1-100-5105A, 1-120-5105A, 1-140-510A, 1-160-5105A