Vacuum Exhaust Mufflers Porous Plastic Mufflers Model No. M-14/30 ANVER Part Number 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) M-14/30 N250FF 1/4″ 0.66 (16.8) 1.40 (35.6) 30 0.123 (3.5)