Foam pre motor filter 203-1374 (2031374).
Bissell replacement filter 2031374 will fit the following vac models:
Healthy Home - 5770, 5770H, 5770P Healthy Home - 5770R, 5770S Healthy Home - 5990 Healthy Home - 6100, 6100E, 6100F Healthy Home - 6100G, 6100N Healthy Home - 6405 Heavy Duty Professional - 50C9, 50C91 Heavy Duty Professional - 93Z6, 93Z61 Heavy Duty Professional - 93Z6R, 93Z6W Single replacement foam filter.