Introducing the RectorSeal 66367 MetaCaulk Electrical-Box Fire-Guard Insert, designed to fit 4x4 electrical boxes for 4s Box applications. This high-quality product is manufactured by RectorSeal and is available in sleek black color. With a product height of 0.3 inches and a length and width of 4.4 inches, this fire-guard insert is an essential building material for any business or industrial setting.

The RectorSeal 66367 MetaCaulk Electrical-Box Fire-Guard Insert is perfect for preventing electrical fires and ensuring the safety of your workplace. This product has been designed to meet all the necessary safety regulations and standards, making it a reliable choice for all your electrical-box needs. Get your hands on this high-quality product today and ensure the safety of your workplace.