Check the listing for details. 4" Diameter Filter Bag Adapter head - Use a pump!. Condition: New. Listed at 11.00 USD. Filter Bag Adapter Turn this filter head adapter sideways and slide it into its corresponding filter bag size. Turn it right side up once inside and pull it up to the top. The adapter will hold tight against the ring of the bag filter, allowing you to force fluids through it with pressure from a pump without spilling fluid over the top of the bag. You can now attach this filter head adapter to an NPT threaded pipe and attach it to pump. ***Please take note of how much pressure and flow your bag filters can handle without external support*** Typically speaking, plastic/felt bags can handle about 10 psi of pressure without degradation to the filtering process. This filter bag adapter is ideal for use with our SEWN filter bags which have a carbon steel ring for support. They do not work with our WELDED filter bags which have a plastic collar flange. For our available filter bags, please see: Sewn Filter bags Welded FIlter Bags (Does not work with filter bag adapter, use with gravity or filter bag housings only)Filter Bag Adapter Turn this filter head adapter sideways and slide it into its corresponding filter bag size. Turn it right side up once inside and pull it up to the top. The adapter will hold tight against the ring of the bag filter, allowing you to force fluids through it with pressure from a pump without spilling fluid over the top of the bag. You can now attach this filter head adapter to an NPT threaded pipe and attach it to pump. ***Please take note of how much pressure and flow your bag filters can handle without external support*** Typically speaking, plastic/felt bags can handle about 10 psi of pressure without degradation to the filtering process. This filter bag adapter is ideal for use with our SEWN filter bags which have a carbon steel ring for support. They do not work with our WELDED filter bags which have a plastic collar flange. For our available filter bags, please see: Sewn Filter bags Welded FIlter Bags (Does not work with filter bag adapter, use with gravity or filter bag housings only)