JCW Acoustic & Fire Socket Box Insert is designed for a single or double socket. Pre-fabricated from Class O foam, this insert can be retrofitted into existing socket boxes or it can be fitted into new boxes. When installed in a socket box this insert will eliminate sound transfer through walls, making it a cost-effective addition to complete any acoustic build-up. This insert, when placed in a socket box, eliminates sound transmission through walls, making it a cost-effective addition to any acoustic build-up. It is simple to instal and has been reviewed in compliance with BS EN ISO 140-3. (1995). Contact us today to find out more.