Jim Bowen 1 Posted December 9, 2014 My gruven crack pipe boasted it came with some NASA grade o-rings. I couldn't distinguish them from the ebay grade ones :lol: Quote Share this post Link to post Share on other sites
Roger Chatfield 0 Posted December 9, 2014 My gruven crack pipe boasted it came with some NASA grade o-rings. I couldn't distinguish them from the ebay grade ones :lol: Personally I'd use the ebay ones, NASA doesn't have a very good track record when it comes to O seals. Rog. Quote Share this post Link to post Share on other sites
