Vacuum System AccessoriesFlow-Through Silencers Model No.: FTS-1.5 Part Number Ain. (mm) Bin. (mm) D1G Thread D2in. (mm) D3in. (mm) Weight oz. (g) FTS-1.5 0.69 (17.5) 5.5 (139.7) G 1-1/2 1.32 (33.5) 2.24 (57) 7.6 (215)