YH Maialan Replacement Filter Kit for Shop Vac 90304/90585 – 18.9 L+ Cartridge, Foam Sleeves & Lid

The YH Maialan Replacement Filter kit gives your Shop Vac 90304/90585-compatible 5-gallon (and larger) wet/dry vacuums a washable cartridge filter, foam sleeves, and lid for reliable dust and debris capture.

Keep your wet/dry vacuum running at peak performance with a replacement cartridge and foam sleeve set designed for Shop Vac models using the 90304 cartridge pattern. This kit includes one high-efficiency cartridge, two removable foam sleeves for wet pickup, and a lid so you can swap configurations for wet or dry jobs without hunting for parts. The components are reusable and simple to wash, making them a practical, cost-effective maintenance solution for home workshops, garages, and job sites.

Which parts are included and what sizes do they fit?

The kit contains one cartridge filter (90304), two foam sleeve filters (90585), and a plastic lid. The cartridge measures 7.25 inches diameter by 6.5 inches tall with a 5.9-inch inner diameter, intentionally sized for many 5-gallon and larger Shop Vac wet/dry units.

• One 90304 cartridge filter: 7.25" diameter × 6.5" height, inner diameter 5.9"
• Two 90585 foam sleeves for wet pickup
• One matching lid for secure installation

Can I use the cartridge filter and foam sleeve at the same time?

No — the cartridge and foam sleeve are intended for different cleanup modes. Use the cartridge filter for dry debris and dust capture, and use the foam sleeve when performing wet pickup to protect the cartridge from moisture. Installing both together can restrict airflow and damage one or both parts.

• Choose cartridge for dry vacuuming (dust, sawdust, fine particles)
• Choose foam sleeve for wet or mixed wet/damp pickup
• Avoid combining both filters to prevent clogging or damage

Which Shop Vac models does this replacement fit?

This replacement set is built to be compatible with many Shop Vac models that use the 90304 cartridge or similar patterns. It replaces OEM 90304 and related part numbers and fits a broad range of 5-gallon and larger wet/dry vacuums from Shop Vac and compatible brands. Always cross-check your vacuum’s existing filter measurements to confirm fit.

• Designed for Shop Vac OEM 90304 cartridge filter replacements
• Compatible with many 5-gallon and larger Shop Vac models (SS, LB, BLB series and similar)
• Works with vacuums that accept a 7.25" × 6.5" cartridge with a 5.9" inner collar

How do I maintain and install these filters for longest life?

Installation is straightforward and tool-free: remove the old filter, seat the cartridge or foam sleeve over the intake collar, and secure the lid. Both cartridge and foam sleeve are washable; rinse gently and air-dry fully before reinstalling. Replace the cartridge every 3–6 months depending on usage intensity and job conditions.

• Tool-free installation—press into place and attach the lid
• Rinse foam sleeves and cartridge under running water; air dry completely
• Replace cartridge every 3–6 months or sooner with heavy use

Who is this for: The YH Maialan Replacement Filter kit is ideal for homeowners, DIYers, and professionals who own a 5-gallon (or larger) Shop Vac-compatible wet/dry vacuum and want an affordable, reusable filter solution. It suits shops that switch between dry and wet cleanup often, contractors who need reliable filtration on the job, and anyone looking to maintain airflow and suction without frequent disposable replacements.