Vacuum Exhaust Mufflers Porous Plastic Mufflers Model No. M-1032/30 Exact Replacement For P-Series Muffler No. A Thread NPT B Diameter in. (mm) C Length in. (mm) Filter Size Microns Item Weight oz. (grams) N/A 10-32 0.30 (7.6) 0.94 (24) 30 0.018 (0.5)