Octo Cup™

Standard version for Red Sea and 4″ filter sock replacements.

Waterbox version.


Say NO to socks Tupperware® in your tank!

Filter socks are so last year… these filter cups are all the rage!  The Octo Cup™ is designed to work in with most popular sump configurations and is made of clear, 1/8″ acrylic.  The outside flange diameter is 4″ to accommodate the Red Sea Sumps but I also include a 5″ diameter step-up ring that will work with most other filter sock holders (including the one I sell!).  In addition to the larger step-up ring, I also throw in a 2.75″ diameter template for cutting circles out of media such as filter floss.  The tube itself is 3″ o.d. and approx. 6″ tall.

Waterbox – Introducing the world’s FIRST filter cup for Waterbox tanks!!  This will fit the Marine, AIO and Cube models.  The tube itself is 2.25″ O.D. and approx. 6″ tall.

My products are made to order, custom!  Please allow 10 business days for fabrication time for this product.  Because my products are made to order, fulfillment time can rarely take longer.  Please let me know ahead of time if this may be an issue.  Shipping prices listed are to the contiguous U.S.  Please contact us if you live elsewhere and want a shipping quote.

Octo Cup™
Octo Cup™
Price: $19.99
Model :

(Sock holder and Octo Cup™ combo)