20"x 4-1/2" Big Blue single o ring type filter housing without head and O ring

We want to provide a positive buying experience for you. We recommend contacting us before making a purchase to ensure the selected model fits your system. This item is a final sale, therefore incorrect purchases are non-refundable , so it's important to choose the right one. We can provide recommendations but we are not liable for any misinformation, that's why clear pictures of the existing system is an important asset to help us identify the correct model for you the best we can. We thank you for your cooperation and look forward to assisting you in choosing the right model.

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We Always recommend buying a complete set from us to ensure compatibility between the housing and sump