Muffler Air Inlet Size 1/4 in Air Inlet Type BST Air Inlet Gender Male Filter Element Material Stainless Steel Maximum Operating Pressure 300 psi Minimum Operating Temperature 35 Degrees F Maximum Operating Temperature 160 Degrees F Noise Reduction Rating 18 dB Air Outlet Gender Male Air Outlet Size 1/4 in Air Outlet Type BST Body Material Aluminum Minimum Flow Rate 0 scfm Outside Diameter 5/8 in