Nucleoside triphosphate pyrophosphatase that hydrolyzes dTTP and UTP. May have a dual role in cell division arrest and in preventing the incorporation of modified nucleotides into cellular nucleic acids. dTTP + H2O = diphosphate + dTMP + H(+) H2O + UTP = diphosphate + H(+) + UMP Belongs to the Maf family. YhdE subfamily.