Dive Lab charts make it simple to identify exact location of the O-Ring – by part number

1. SL 17AB Soft Goods
2. SL 27 Soft Goods
3. SL 27 with 455
4. KM 37/17K/17C Soft Goods
5. KM 37 57 with 455 Regulator Soft Goods 
6. KM 37SS Soft Goods
7. KM 47 Soft Goods
8. KM 57 Soft Goods
9. KM 77 Soft Goods
10. KM 97 Soft Goods
11. KMB 18 28 Soft Goods
12. KMB 18 28 with 455 Regulator Soft Goods
13. 455 Balanced Regulator Soft Goods Rebuilt
14. Quick Reference Helmet O-Ring Location Chart