Check the listing for details. WOODRIVER Dust Connection Blast Gate - 4" Sewer Pipe - 4" Hose. Condition: New. Listed at 22.18 USD. WOODRIVER Dust Connection Blast Gate - 4" Sewer Pipe - 4" Hose, 180213, THIS BLAST GATE FITS ON the inside of 4" sewer and drain pipe with a 4.065" ID - Pipe marked as manufactured to standard ASTM D2729 is suitable for use with this fitting, ADAPTS 4" sewer and drain pipe to 4" left-hand threaded dust collection hose, MOLDED FROM ABS plastic material for rigidity and durability, ISOLATE AND CONTOL AIRFLOW at each branch of your system by allowing the dust collector to draw air from only one machine at a time, WoodRiver® Dust Connection™ Blast Gate Fittings make it possible to isolate and control airflow at each branch of your system by allowing the dust collector to draw air from only one machine at a time. This blast gate fits on the inside of 4" sewer and drain pipe with.