The Cherne 12" Iron Grip Bypass Plug (part #268-128) is the largest Iron Grip in the Cherne line — a 28 lb cast iron mechanical test plug with 1" NPT bypass for 12" sewer and storm pipe. Rated for 2.6 PSI / 6 ft. head pressure. Fits 12" pipe (usage range 11.56"–12.2" ID). The 19.5" long cast iron body with natural rubber O-ring provides maximum durability for large-bore municipal pipe. The 1" bypass on this model is larger than the 1/2" used on smaller sizes.

Key Features

• Cast iron construction — heavy-duty durability for repeated field use
• 1" NPT threaded bypass — controlled flow-through during testing
• 2.6 PSI / 6 ft. head pressure — rated for low-pressure water and air tests
• Natural rubber O-ring — seals round and out-of-round pipes
• Large wing nut design — easy, tool-free installation and superior sealing

Technical Specifications

Applications

Low-pressure bypass plugging on 12" sewer trunk lines, temporary blocking during major municipal pipe repairs, and flow diversion on large-diameter storm systems. At 2.6 PSI, this is strictly a low-head plug. For higher pressure at 12", use the T-Handle Gripper with Bypass (10 PSI) or the I-Series Muni-Ball (15 PSI).

Questions on sizing or bulk pricing? Call (866) 514-3684 or email us — same-day shipping on in-stock items, tax-exempt purchasing for qualified accounts.