Spa Fitter
Bullfrog Spas A8D Replacement Cover
The Bullfrog Spas A8D takes the AIRCAP 1™ X-Large — a foam-free replacement hot tub cover for square spas 92"–94". The A8D's cabinet measures 94" x 94", inside the X-Large's range. The cover weighs 35–40 lb for life, costs $1,195, is engineered to comply with ASTM F1346-23, and carries a 3-year limited warranty.
| Spa cabinet | 94" x 94" |
|---|---|
| AIRCAP 1™ size | X-Large fits 92"–94" |
| Cover weight | 35–40 lb — constant for life |
| Price | $1,195, free US shipping |
| Skirt | Ziptech™ modular, three lengths included |
| Safety | Engineered to comply with ASTM F1346-23 |
| Warranty | 3-year limited warranty |
Why the X-Large fits the A8D
The AIRCAP 1™ comes in six sizes covering square spas from 77" to 94". Each size is built to overhang its band slightly — that is how a spa cover is meant to sit — so the X-Large, which fits cabinets 92"–94", covers the A8D's 94" x 94" shell with the right overhang.
At 94" the A8D is at the top of the X-Large's 92"–94" range — the largest cabinet this size covers. It is also the largest square cover we make. Within Bullfrog Spas, the A8D shares that 94" x 94" cabinet with A8, A8L, M8 and R8 — same footprint, same cover. Bullfrog Spas builds the 19 models we fit on 5 footprints, and the A8D is on the largest of them; the line spans 5 of the six AIRCAP 1 sizes.
Cabinet dimensions can change between model years. Before ordering, measure your A8D at its widest point across the top, in both directions, including any acrylic lip that overhangs the cabinet — the SureFit™ guide walks through it in two measurements. If a figure you have found elsewhere is larger than ours, an overhanging lip is the usual reason. If your spa measures between two sizes, round up.
Every spa in our catalogue that measures 94" x 94" is on one page: hot tubs that take a 94" × 94" cover — the same AIRCAP 1™ X-Large, at the same price.
How the AIRCAP 1™ is built
Instead of a rigid foam core wrapped in vinyl, the AIRCAP 1™ uses welded drop-stitch construction: a sealed air chamber with no foam to absorb water, so it does not become the waterlogged two-person lift that ends most foam covers. More on how it insulates, how it holds up, and why it is foam-free — or estimate what your current foam cover weighs.
Every Bullfrog Spas model we fit
| Model | Cabinet | AIRCAP 1™ |
|---|---|---|
| Calm6 | 78" x 78" | XX-Small |
| Calm7 | 84" x 84" | Small |
| Calm7L | 84" x 84" | Small |
| A7 | 88" x 88" | Medium |
| A7D | 88" x 88" | Medium |
| A7L | 88" x 88" | Medium |
| R7 | 88" x 88" | Medium |
| R7L | 88" x 88" | Medium |
| X7 | 88" x 88" | Medium |
| X7L | 88" x 88" | Medium |
| M7 | 91" x 91" | Large |
| A8 | 94" x 94" | X-Large same cover as the A8D |
| A8D (this page) | 94" x 94" | X-Large |
| A8L | 94" x 94" | X-Large same cover as the A8D |
| M8 | 94" x 94" | X-Large same cover as the A8D |
| R8 | 94" x 94" | X-Large same cover as the A8D |
| R8L | 94" x 94" | X-Large same cover as the A8D |
| X8 | 94" x 94" | X-Large same cover as the A8D |
| X8L | 94" x 94" | X-Large same cover as the A8D |
Bullfrog Spas A8D cover: common questions
What size hot tub cover fits the Bullfrog Spas A8D?
The Bullfrog Spas A8D takes the AIRCAP 1 X-Large, which fits square hot tubs measuring 92"–94" across. The A8D's cabinet measures 94" x 94", inside that band. Measure your spa side to side across the top of the cabinet to confirm before ordering.
Will the AIRCAP 1 fit a Bullfrog Spas A8D?
Yes — the A8D's 94" x 94" square cabinet falls in the AIRCAP 1 X-Large's 92"–94" range, and the Ziptech modular skirt system ships with three skirt lengths so the drop over the cabinet adjusts without a custom order. Cabinet sizes can change between model years, so confirm with two quick measurements.
How much does a replacement cover for the Bullfrog Spas A8D cost?
The AIRCAP 1 costs $1,195 in every size, including the pump, three Ziptech skirt lengths, and tie-down straps, with free US shipping and 30-day returns. Unlike a foam cover it has no foam core to waterlog, so it stays at its original 35–40 lb weight for life.
How heavy is a replacement cover for the Bullfrog Spas A8D?
The AIRCAP 1 X-Large weighs 35–40 lb and keeps that weight permanently — its sealed drop-stitch air core cannot absorb water. A foam cover starts at 40–75 lb and gains weight as the foam saturates.
Not a A8D?
The Spa Fitter matches the current models of every major brand to the right AIRCAP 1™ — or measure any square spa with SureFit™.