Spare oil-bearing INON yellow O-ring for housing body. Compatible Housing: X-2 for EOS10D, X-2 for EOS20D, X-2 for EOS30D X-2 for EOS50D/40D, X-2 for EOS60D, X-2 for EOS70D, X-2 for EOS6D X-2 for GF1, X-2 for GF2