Sigma Electric ProConnex 49212 Strain Relief Cord Connector 1/2-Inch, 1-Pack Strain relief cord grip connector Connects S, SO, ST, SJ, SJO and SJT cord to a 1/2-in knockout in a box or enclosure Zinc die-cast construction and suitable for wet locations when used with a sealing locknut (not included) For flexible cord 0.375" - 0.500" Product is UL & CSA listed