7. Where a site is built, replaced or refurbished in whole, operators shall install and use only commercially available zero-emitting pneumatic devices, compressors, atmospheric pressure storage tanks, sampling and measuring devices and dry gas seals. Where a site is replaced or refurbished in part, operators shall install and use in that part only commercially available zero-emitting pneumatic devices, compressors, atmospheric pressure storage tanks, sampling and measuring devices and dry gas seals.