The patented designed set contains a non-latex neck seal firmly sealed between neck rings. The non-latex compound will stretch and return to shape even after multiple uses. Neck seal has large opening; ribbing lines for cutting; raised ports to stop drainage into tubing; and an accessory port. Large No Port Hood measures 12 3/8” (314mm) x 11 ½” (291mm). Neck seal is single-patient, multi-use and Hood is multi-patient use.