Muellema Posted June 15 Share Posted June 15 Hi all, current looking for spare O-rings for the Vacuum Valve for my Nauticam housing. Nauticam charges 15,-€ for this part. Which is a rip-off from my point of view. May be we can open a topic where everybody who knows dimensions of O-Rings for UW housings will share his knowledge . So we can buy this parts manufacturer independent. My focus here is NOT mainly the big housing O-rings (would be nice too), but O-rings for accesories, ball mounts, threads, valves, flash sockets...... Br Markus 2 Link to comment Share on other sites More sharing options...
Kraken de Mabini Posted June 15 Share Posted June 15 (edited) Yes, you are quite right in speaking out about the high cost -"rip-off" - of O-rings. Some O ring replacement options are discussed here: https://wetpixel.com/forums/index.php?/topic/69152-orings-for-sea-and-sea/&tab=comments#comment-437649 When replacing an O-ring, it is useful to keep in ming that all underwater equipment O-rings are metric (except Ikelite), and while most are made of "nitrile" rubber, some are "silicone". Replacements must also be metric, but at times one can replace a silicone O ring with a nitirle one. An O-ring size is described by its inner diameter and ring cross-section, in millimeters. It is best measured with a metric caliper, but a metric ruler may serve. It can be a bit difficult to measure the i.d. of a large O-ring. One trick is with a drawing compass, to draw a series of concentric circles about the inner diameter of the O ring, then overlay the O ring on the circles until the drawn circle matches the I.D. of the O ring. Replacement metric nitrile O-rings can be found at The O-Ring Store, Backscatter Underwater Photo, eBay, Amazon, or thru a web search. The price of a given O ring may vary widely, depending on the seller. For years I have bought from The O-Ring Store. Good luck! https://www.theoringstore.com/ https://www.backscatter.com/search?keywords=O ring Edited June 15 by Kraken de Mabini 1 Link to comment Share on other sites More sharing options...
bvanant Posted June 18 Share Posted June 18 The o-ring store has a tool (https://www.theoringstore.com/store/index.php?main_page=index&cPath=345) called Olypsys that lets you measure unknown o-rings pretty accurately. A good digital caliper (english or metric) will get you cross section pretty well. Also remember that not all o-rings from Japanese companies are metric sizes, many are JIS. Cheers, Bill 1 Link to comment Share on other sites More sharing options...
Kraken de Mabini Posted June 23 Share Posted June 23 Should anybody need a Japanese O ring, the chart is here: https://www.marcorubber.com/downloads/marco-o-ring-size-chart-japanese.pdf 1 Link to comment Share on other sites More sharing options...
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