A method comprising: connecting a housing (10, 50) to a fluid system (100, 200, 300, 400, 500, 600) containing an electrorheological fluid in a reservoir (101, 401), the fluid system (100, 200, 300, 400, 500, 600) comprising a gas remover (102, 202, 302), wherein connecting the housing (10, 50) to the fluid system (100, 200, 300, 400, 500, 600) connects an interior volume of the housing (10, 50) to an interior volume of the fluid system (100, 200, 300, 400, 500, 600), wherein the housing (10, 50) is a polymeric housing and the interior volume of the housing (10, 50) comprises first and second chambers (12, 13, 52a, 52b, 53a, 53b) connected by a channel (20, 60.1, 60.2, 60.3, 60.4), wherein the housing (10, 50) comprises an electrode coinciding with at least a portion of the channel (20, 60.1, 60.2, 60.3, 60.4); after connecting the housing (10, 50) to the fluid system, pumping the electrorheological fluid through the reservoir (101, 401) while pumping the electrorheological fluid through the housing (10, 50) and through the gas remover (102, 202, 302); and after pumping the electrorheological fluid through the housing (10, 50) and through the gas remover (102, 202, 302), disconnecting the housing (10, 50) from the fluid system (100, 200, 300, 400, 500, 600), and wherein pumping the electrorheological fluid through the housing (10, 50) comprises: performing a first pumping of the electrorheological fluid through the housing (10, 50) while the housing (10, 50) is in a first orientation, after the first pumping, placing the housing (10, 50) in a second orientation, and performing a second pumping of the electrorheological fluid through the housing (10, 50) in the second orientation. connecting a housing (10, 50) to a fluid system (100, 200, 300, 400, 500, 600) containing an electrorheological fluid in a reservoir (101, 401), the fluid system (100, 200, 300, 400, 500, 600) comprising a gas remover (102, 202, 302), wherein connecting the housing (10, 50) to the fluid system (100, 200, 300, 400, 500, 600) connects an interior volume of the housing (10, 50) to an interior volume of the fluid system (100, 200, 300, 400, 500, 600), wherein the housing (10, 50) is a polymeric housing and the interior volume of the housing (10, 50) comprises first and second chambers (12, 13, 52a, 52b, 53a, 53b) connected by a channel (20, 60.1, 60.2, 60.3, 60.4), wherein the housing (10, 50) comprises an electrode coinciding with at least a portion of the channel (20, 60.1, 60.2, 60.3, 60.4); after connecting the housing (10, 50) to the fluid system, pumping the electrorheological fluid through the reservoir (101, 401) while pumping the electrorheological fluid through the housing (10, 50) and through the gas remover (102, 202, 302); and after pumping the electrorheological fluid through the housing (10, 50) and through the gas remover (102, 202, 302), disconnecting the housing (10, 50) from the fluid system (100, 200, 300, 400, 500, 600), and wherein pumping the electrorheological fluid through the housing (10, 50) comprises: performing a first pumping of the electrorheological fluid through the housing (10, 50) while the housing (10, 50) is in a first orientation, after the first pumping, placing the housing (10, 50) in a second orientation, and performing a second pumping of the electrorheological fluid through the housing (10, 50) in the second orientation. performing a first pumping of the electrorheological fluid through the housing (10, 50) while the housing (10, 50) is in a first orientation, after the first pumping, placing the housing (10, 50) in a second orientation, and performing a second pumping of the electrorheological fluid through the housing (10, 50) in the second orientation.