The full notice can be viewed on the Hollis website. Hollis has recalled certain counterlungs for its Explorer rebreather. "We have traced this problem back to one production lot of counterlungs that had weak welds around the retainer fitting, and affected counterlungs can develop leaks over time," the company said in a press release. It has published the serial numbers on its website, and divers with affected counterlungs should contact their local Hollis rebreather dealer; the company will send a free pair of new counterlungs.