- Genuine Hendrickson Air Spring S-21800
- Suits Hendrickson Intraax AA230, AA250 and Maxitraax suspenions
- Complete assembly including piston
- Hendrickson brand
- Bellows may be marked with 1T15VP4, 1T17CA-5, 1T17CA5 etc
- Cross ref:
- Hendrickson: C-20900, C-21800, S21800, HNS21800
- Fleetline: 70.0047
- Protex/ATAP: BP1828P, BP1828
- Maxus: SP0057M
- Firestone: W01-455-8742, W01-358-8709, W01-358-8751
- SCTEG: SP0057GA