Vacuum Exhaust Mufflers Porous Plastic Mufflers Model No. M-10/100 ANVER Part Number Exact Replacement For P-Series Muffler No. AThread NPT BDiameter in. (mm) CLength in. (mm) Filter Size Microns Weight oz. (g) M-10/100 N1000 1″ 1.89 (48.0) 6.61 (168) 100 1.20 (34.02)