Main structural elements of a piston

1. Groove for the first pressure ring

2. Groove for the second pressure ring

3. Ring separators

4. Groove for oil-draining ring

5. Oil-draining canal

6. «Fridge»

7. Piston skirt

8. Boss for pin canal

9. Relief canal

10. Groove for lock ring

11. Pin canal

12. Piston skirt

13. Piston head

14. Ni-resistive insertion

15. Oil-chilled cage

16. Combustion chamber

17. Conic piston boss

18. Piston bottom