Bests & Worsts Reviews from Amazon

I have used Gamma2's seals for over ten years. I have purchased in total, approximately 100. Until recently, I recommended these to everyone. They were strong, durable, and effective. Recently, however, it appears that Gamma2 chose to modify its lid design. Many cracked at the very first tap of the rubber mallet. This is the same rubber mallet I've used to install all of my other Gamma2 seals over the past ten years, doing it the way that is recommended by Gamma2 themselves. The seals I received are very different from the ones I used to use. The plastic is brittle. The o-rings are loose. Screw-in tightening feels springy, instead of solid. And the whole set feels light - enough so that I took a new seal and one of my old Gamma2 seals to a scale and weighed them. The previous seals weigh in at 337 grams. The new ones are 295 grams. I suspect that if I took a micrometer to measure the thickness of the seal ring's plastic, it would also be thinner. To sum up, these are the problems evident in the lids I have purchased in 2020: - brittle plastic deforms easily and cracks when struck with mallet - lids do not stay sealed; "springy" light plastic means lids unseal themselves a few days later even after being tightly screwed in - orings are oversized and routinely fall out during regular use.