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The Rigid Base Option comes with a special cover that has a sewn-in envelope at the bottom that keeps the material in place under the cushion where it is needed, thus eliminating the sliding effect. In addition, unlike most manufacturers who use apple wood, the material is durable polycarbonate.Single Valve.
(HCPCS Code K0734 - Cushion equal or less than 21")
(HCPCS Code K0735 - Cushion greater than 21")

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Star cushion on the left: 4in. Standard Contour Cushion shown with Dual Valve Configuration.
Star cushion on the right: 4in. Standard Contour cushion with Four Valve Configuration.
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| For Chair Size |
Cushion Width |
Cushion Depth |
Cushion Height |
| 16in x 16in |
15 1/2in |
15 1/2in |
4in |
| 16in x 18in |
15 1/2in |
17 1/4in |
4in |
| 18in x 16in |
17 1/4in |
15 1/2in |
4in |
| 18in x 18in |
17 1/4in |
17 1/4in |
4in |
| 18in x 20in |
17 1/4in |
19 1/4in |
4in |
| 20in x 18in |
19 1/4in |
17 1/4in |
4in |
| 20in x 20in |
19 1/4in |
19 1/4in |
4in |
| 22in x 18in |
21in |
17 1/4in |
4in |
| 22in x 20in |
21in |
19 1/4 |
4in |
| 22in x 22in |
21in |
21in |
4in |
*W - Width Measurement (side to side of seat) D - Depth Measurement (front to back of seat) H - Height of cushion (bottom to top)
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