The 4" Heavy Plastic Test Plug with Metal Bolt and Wing Nut is designed for reliable sealing in plumbing systems. Constructed from heavy-duty plastic, this test plug provides excellent durability and resistance to wear. The metal bolt and wing nut allow for easy installation and removal, ensuring a secure fit. This test plug is ideal for testing drainage systems and can be used in various plumbing applications. Its robust design meets industry standards for quality and performance, making it a reliable choice for your plumbing needs.