48 CFR §52.246-21

As prescribed in 46.710(e)(1), the contracting officer may insert a clause substantially as follows in solicitations and contracts when a fixed-price construction contract (see 46.705(c)) is contemplated, and the use of a warranty clause has been approved under agency procedures: Alternate I (APR 1984). If the Government specifies in the contract the use of any equipment by brand name and model, the contracting officer may add a paragraph substantially the same as the following paragraph (k) to the basic clause: