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Direct from manufacturer. Made in the USA.

Filter material: 100% monofilament polyester with water repellent finish standard on all pre-filters.
Closed top, round tapered pre-filter

Rain Sock For Arlen Ness 90 Degree Monster Sucker Air Cleaner Standard Kit (Fits over air filter)

Cross Reference: 81-002, 81-022, 81-003, 81-023, 81-004, 81-024