Terminal Box Cover Complete With Cable Gland L112mm, W92mm, H50mm The Terminal Box Cover is supplied with 1 fixed 20mm hole with a 20mm gland , a second knock though hole is also provided. The Cover has been designed leaving a recess for applying a UV stable MS Polymer such as Bostik STR 360 or ISR 70-03 as opposed to mounting with screws in order to reduce the risk of water ingress. Ref M211