Rolock 90 o-rings - another post

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Apteryx54

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Hi, have had the Rolock 90 system for several months (~20 dives) with no issues and appreciate the bayonet and twist locking. Thought I should add some spare o-rings to the save-a-dive kit as although I lightly lube the mating o-ring, our dive sites are often silty sandy with some abrasion. Through the forum and discussion on Rolock 90 o-rings and looking at the Rolock website, ( O-rings for bayonet lock (from 2006) – Rolock ) I sourced and purchased the O-Ring: Buna-N, Round, 2.5 mm C.S., 96 mm I.D.
My query is that the o-rings at 96mm I.D. appear to be smaller than the groove on the drysuit side ring which measures ~104mm with vernier (see pics)
First photo shows a new o-ring inside the one I removed with two more new o-rings. (is the old one stretched?)
2nd photo of vernier measuring the drysuit ring ID on the o-ring groove.

The new 96mm o-rings do fit the ~104mm groove with a gentle stretching. Is this normal?
 

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I don’t know the answer, I have ordered some to see how it works, in 3 years of use so far I haven needed to replace the o ring’s and they are still fine.
 
These appear to be the correct replacement, I have received 10 from Mc Master and changed one , it a good fir but takes a bit to work them into the deep groove, any bigger and they wouldn’t work as they need to be massaged into the groove.
 
These appear to be the correct replacement, I have received 10 from Mc Master and changed one , it a good fir but takes a bit to work them into the deep groove, any bigger and they wouldn’t work as they need to be massaged into the groove.
what was the mcmaster part number if you have that handy?
 
Thanks @lexvil . All good
These appear to be the correct replacement, I have received 10 from Mc Master and changed one , it a good fir but takes a bit to work them into the deep groove, any bigger and they wouldn’t work as they need to be massaged into the groove.
 

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