Review on Mr Heater Rings Soft Fittings by David Pirlet

Didn't know what to expect for such a good price. I received them in a resealable bag in the display's retail packaging. This added feature of the inner pouch made it very easy to open the outer pouch without the o-rings flying all over the place. 6 that I have used to replace old and/or missing o-rings are great. I purposely tried to ruin one of these and it kept slipping into the ring groove. A minor issue is the stability of the plasticizer and its operating temperature range. These factors are now being monitored and I will report my results in 30 days.