Hello

i want to draw a piece like the yellow one shown in figure:

http://www.nbr-o-rings.com/photo/pl423742-colorized_elastic_rubber_seal_aflas_nbr_o_rings_for_steel_industry_gas_compressor.jpg

i think that i have to use the revolution's cut but i don't know how.

Consider that i've found these measures:

internal dim: 38.30mm

external dim: 41.40mm

thickness: 2mm

can you help me?

Thank you