Unable to apply. The installation of gas self-closing valve is charged, not free. Heze, a prefecture-level city under the jurisdiction of Shandong, is the peony capital of China, which was called Cao Zhou in ancient times. Located in the southwest of Shandong province, at the junction of Shandong, Jiangsu, Henan and Anhui provinces. Heze City has jurisdiction over seven counties, namely Mudan District, Dingtao District, Caoxian County, Chengwu County, Shanxian County, Juye County, Yuncheng County, Juancheng County and Dongming County, 1 provincial economic and technological development zones, 1 high-tech development zones and 168 township and sub-district offices (township 65438