Vacuum Exhaust Mufflers Porous Plastic Mufflers Model No. M-34/100 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-34/100 N750 3/4″ 1.51 (38.3) 5.82 (148) 100 0.60 (17.01)