Filter-Flo Sanitary Manhole Vent

Unique venting design permits adequate air flow for 3" inlet/outlet pump. Takes only seconds to attach. Can be moved from tank to tank. Ideal for plant unloading operations. Fits manholes up to 19" diameter. Spun cover protects filter pad against damage and moisture when in use. Provides protection against the danger of internal vacuum while unloading. Portable and lightweight.