Spa Fitter
AquaRest Spas AR-600 (Discover 600) Replacement Cover
The AquaRest Spas AR-600 (Discover 600) takes the AIRCAP 1™ XX-Small — a foam-free replacement hot tub cover for square spas 77"–79". The AR-600 (Discover 600)'s cabinet measures 79" x 79", inside the XX-Small'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 | 79" x 79" |
|---|---|
| AIRCAP 1™ size | XX-Small fits 77"–79" |
| 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 XX-Small fits the AR-600 (Discover 600)
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 XX-Small, which fits cabinets 77"–79", covers the AR-600 (Discover 600)'s 79" x 79" shell with the right overhang.
At 79" the AR-600 (Discover 600) is at the top of the XX-Small's 77"–79" range — the largest cabinet this size covers. Measure before ordering: half an inch more and the cover you need is the X-Small. Within AquaRest Spas, the AR-600 (Discover 600) shares that 79" x 79" cabinet with AR-500 (Discover 500) — same footprint, same cover. The 11 AquaRest Spas models we fit sit on 3 footprints, and the AR-600 (Discover 600) is on the smallest of them; together they span 2 of the six AIRCAP 1 sizes.
Cabinet dimensions can change between model years. Before ordering, measure your AR-600 (Discover 600) 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 79" x 79" is on one page: hot tubs that take a 79" × 79" cover — the same AIRCAP 1™ XX-Small, 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 AquaRest Spas model we fit
| Model | Cabinet | AIRCAP 1™ |
|---|---|---|
| AR-500 (Discover 500) | 79" x 79" | XX-Small same cover as the AR-600 (Discover 600) |
| AR-600 (Discover 600) (this page) | 79" x 79" | XX-Small |
| DayDream 2500 | 81.5" x 81.5" | X-Small |
| DayDream 2800L | 82" x 82" | X-Small |
| DayDream 2800S | 82" x 82" | X-Small |
| DayDream 3000L | 81.5" x 81.5" | X-Small |
| DayDream 3500L | 82" x 82" | X-Small |
| DayDream 3500S | 82" x 82" | X-Small |
| DayDream 4500 | 81.5" x 81.5" | X-Small |
| Dynamic 84L | 82" x 82" | X-Small |
| Dynamic 84S | 82" x 82" | X-Small |
AquaRest Spas AR-600 (Discover 600) cover: common questions
What size hot tub cover fits the AquaRest Spas AR-600 (Discover 600)?
The AquaRest Spas AR-600 (Discover 600) takes the AIRCAP 1 XX-Small, which fits square hot tubs measuring 77"–79" across. The AR-600 (Discover 600)'s cabinet measures 79" x 79", inside that band. Measure your spa side to side across the top of the cabinet to confirm before ordering.
Will the AIRCAP 1 fit an AquaRest Spas AR-600 (Discover 600)?
Yes — the AR-600 (Discover 600)'s 79" x 79" square cabinet falls in the AIRCAP 1 XX-Small's 77"–79" 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 AquaRest Spas AR-600 (Discover 600) 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 AquaRest Spas AR-600 (Discover 600)?
The AIRCAP 1 XX-Small 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 AR-600 (Discover 600)?
The Spa Fitter matches the current models of every major brand to the right AIRCAP 1™ — or measure any square spa with SureFit™.