Ran through the math years ago on the old Green forum. Back then, the hipac was being sold as a 3000psi capable unit, and with that pressure and area in mind, upgrading the valve retention screw to an 8-32 low head shcs was reasonable and easily accomplished. I've never seen co2 reach 1500psi, but swapping that screw is not hard to do and seems reasonable for hpa use. Three such screws provide a 3x safety factor on a 3000psi mwp 22xx pcp build, with only bearing stress on the tube wall being slightly shy. Three screws is serious overkill for hipac or eliminator use...IMO.The Green forum link will be gone now, but for reference; https://www.gatewaytoairguns.org/GTA/index.php?topic=97198.0Al
Powerlet eliminator does not pressurize the gas tube...right? Also assume you’re going to hook an HPA tank to it (as the unit itself has a super tiny air volume).So pressure only acts on the inside diameter of the valve (plus however tight you screw it down)....Feed it normal co2 pressure and you’d likely be just fine.