In the GARDENA Valve Box V1, either a 24 V Irrigation Valve (Art. No. 1278-20) or an Irrigation Valve 9 V (Art. No. 1251-20) can be installed below ground. The telescopic screwed connection allows easy valve mounting and removal. The cover can be locked for child safety. The GARDENA Valve Box V1 has a 1" male thread.