Tuff Seal RPG Series Cord Grips features a PG thread so that it can mate with an internal PG thread of an enclosure, machine or other equipment being connected. Features of these grips are identical to those of our standard RSR Series Aluminum Cord Grips. These grips are offered in PG 11‑13.5‑16‑21‑29 and 36 and can be ordered with or without mesh attachments.