Where can I optain theWAP Filter Cartridge Double opening thanks?

Thanks for the prompt! While I don't have specific pricing for that filter cartridge yet, I'd be happy to search PriceCheck on your behalf. Often the best deals can be found by checking a few of the top retailers. In the meantime, please let me know a bit about the project you're working on - are you filter cleaning a home aquarium, industrial equipment, or something else? Learning more will help ensure I find options that suit your needs. Finding the right product at the right price is important to me, so don't hesitate to ask if you have any other questions!