4516. COVER W/BUBBLE SS . Covers comply with 2005 NEC Section 406.8(A) and 406.8(B)(2). . Plate is Type 302 Stainless Steel for corrosion resistance. . Transparent silicone rubber mat seals plate and opening from contamination. . Switch easily actuated through flexible silicone bubble. . Silicone mat maintains pliability from -100 degrees F to +250 degrees F. .