CL400 4" Tractor Muffler ClampOne New Aftermarket Replacement 4" Muffler Clamp for Tractors Universal Fit This heavy duty 2 bolt U bolt saddle muffler clamp is designed to secure 4 inch exhaust pipes and muffler stacks on tractors and agricultural equipment. A universal fit exhaust clamp used across a wide range of tractor brands, it provides a reliable, vibration resistant connection between exhaust stack components. Specifications Pipe Diameter: 4" (fits 3 3 4" to 4" I. D.)