Voker Holding Tank Vent Filter - Direct Replacement for Sealand/Sanigard/Dometic OEM Filters (5/8") Voker's exclusive hard-packed carbon manufacturing process eliminates air gaps within the carbon chamber Featuring a high-density carbon bed, coupled with air diffusing retaining barriers our filters produce unrivaled air quaility and flow Available at an economical price point, Voker filters offer unprecedented value, quality and consistancy Our minimalistic design promotes ease of use and reliability Made with pride in the USA