Keys Backyard Spas
Keys Backyard hot tubs (Keys Fitness, sold through warehouse clubs in the 2000s) are an obsolete brand, but the parts are not: they were built on Balboa control systems and use a standard 25 sq ft screw-in filter. Start with the two things owners look for most — the circuit board and the filter — then match anything else from the label inside the equipment door.
Keys Backyard parts
No factory parts book exists for Keys Backyard any more. Photograph the label on your spa pack and the part you are replacing, send them through the form below, and we will match the replacement before you order.
Shop: Keys Backyard Filters | Circuit Board 54757 | Balboa Parts | All Hot Tub Filters
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✅ Not Sure It Fits? Verify Before Ordering
Keys Backyard parts vary by model year and the Balboa control box number on the label.
To confirm the correct replacement, send clear photos of:
- The label on the spa pack (control box number) or the part you are replacing
- Your spa serial number sticker
- The equipment area with the door off
EZ Hot Tub Parts confirms fitment before you order, so you do not pay return freight on a wrong part.
Keys Backyard parts questions
Keys Fitness (Texas) sold Keys Backyard spas through warehouse clubs in the 2000s. The company no longer supports them, so replacements come from the component makers — Balboa for the control system, standard filter sizes for the cartridge.
Control boxes 54757, 54757-01, 53752-01, 53752-03, 54344 and 54345 (Balboa VS510SZ). Photograph your box label to confirm; the board page explains the heater adaptor and the copper strap that must be removed.
The 25 sq ft cone-handle screw-in: 4-5/8″ across, 9-3/4″ long, 2″ thread (Pleatco PGS25P4, Unicel 4CH-24). See the Keys Backyard Filters page.
Yes — send the spa pack label, a photo of the part and your serial number through the form above and we will match the replacement before you order.