Needed new O-rings for our Freeze Dryer Vacuum Pump hose. Ordering these were the perfect solution today, and more left for future hose maintenance.

A few of my MSR fuel bottle O-rings were starting to crack and show signs of failure. I did quite a bit of research to find replacement O-rings. The standard replacement O-rings run from .50- $1.00 and anywhere from $2.00-$10.00 for S&H. I learned from more experienced gear nuts than I, The MSR O-ring is a soft silicone that is not chemical resistant. While the original MSR O-ring held up quite well for me with minimal use over the last 8 years, it could have lasted longer if MSR had used higher quality O-rings.
I searched for an O-ring that was made with longevity and direct contact with corrosive liquids in mind. The Viton O-Ring is made for direct contact with chemicals, such as fuel, oil, diesel, kerosene, white gas, unleaded gas, etc.. The AS568A #213 Viton O-Ring matched the actual dimensions of my old MSR 33oz. Fuel Bottle with gray screw on lid.
It arrived very quickly in the mail. For the price of one MSR replacement O-ring, I purchased 25 higher quality and hopefully longer lasting O-rings for the same price after S&H. I immediately replaced my old MSR 33oz. Fuel bottle's O-ring with the new O-ring. It fit perfectly as far as I could tell. Granted, the O-ring is measured in hundredths of an inch, if I was off a few, it doesn't show. The cap closed correctly, putting pressure on the O-ring. I snugged the cap up to the O-ring and then tightened another half a turn. I left the fuel bottle full of fuel upside down for a few hours with no sign of leakage. A new model MSR 30oz. fuel bottle arrived in the mail as well. I immediately put a new Viton O-ring on it as well. Time will be the true judge of quality. For the same cost as one MSR replacement O-ring, I have enough O-rings for all my MSR fuel bottles to last the rest of my life. Only a 4 star rating until the O-rings get some age and wear on them.

03/02/17 UPDATE: 224 Viton Oring 75A Durometer 1.5" x 1/8" works great for a combat ring when paired with a tailcap ring by Solar Force or SureFire. I bought the 2" OD and it is a little big.

used on hayward pool filter valve connection to filter so o rings need to resist chlorine in water and needed to be viton

I purchased 214 orings on trident and keep getting leaks, I got this one and are working better. I work in a hot and humid environment, you need the best, and this ones has better price

These cross referenced to the Triumph Street Twin shift position sensor that was leaking oil.

Quick fix and bo more oil leak!