Vacuum Exhaust Mufflers Porous Plastic Mufflers Model No. M-1032/30 Exact Replacement For P-Series Muffler No. AThread NPT BDiameter in. (mm) CLength in. (mm) Filter Size Microns Weight oz. (g) N/A 10-32 0.30 (7.6) 0.94 (24) 30 0.01 (0.28)