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Replace garmin hrm tri o'ring

What size garmin hrm tri oring .

Ca i use 19 x 21 x 1mm (ID x OD x Thickness) oring to replace old oring? The real oring size from this forum is 19.05 (id) x 1.14 (thickness).

Thanks

0 Scillonian over 4 years ago

Probably will work fine. It is the nearest metric size to the imperial 3/4" x 3/64" size. The material it is made of is probably more important. I don't know what material the originals are made of but there are posts on the forum where it is mentioned.