They are up on the site now, I must have missed it, I ordered two, and extra o-rings. Now my tanks are in top form. I damaged the o-rings and one tube when I took the mirror polish down to a satin, now the tanks match the endcaps to my provari perfectly, also there were (very slight) machining marks left on the inside carto-hole which I polished out as well, I will think of these tanks as ultra special edition redesigned Stainless MAP DCT Tanks. Love them!