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TPN plugs are ideal for low-pressure testing and in-house handling. The square head design enables easy installation. These plugs protect threaded ports from damage, contamination and moisture. Resistant to oil and heat up to 250 degrees F, but not intended for permanent applications. Fits NPT threads.: : B:.38, C:.83, F: 1.00, PLUGNPTTS: 1-1/4-11-1/2.