Keep your industrial pipes secure and serviceable with this #16 Winter Blow Thru Expansion Plug designed for 4-inch pipes. This professional-grade expansion plug features an integrated Schrader valve, making it ideal for winterization procedures and pressure testing applications. The robust construction ensures a reliable seal while the blow-through capability allows for efficient draining and testing operations. Perfect for maintenance crews and industrial facilities, this expansion plug provides a temporary but dependable solution for pipe maintenance, testing, and seasonal preparation work. The convenient Schrader valve enables easy pressure monitoring and release when needed. Compatible with standard 4-inch pipe systems, this expansion plug delivers the performance and functionality required for professional pipe maintenance and testing procedures.