• The NT-PIPE-SO temperature sensor is designed to work in conjunction with the NetX™ X7, X5 and UP32 thermostat families. The NT-PIPE-SO is a strap on pipe sensor for pipes 1.25" to 4", with a full galvanized single gang box. The NT-PIPE-SO is to be connected to the NT-URS sensor electronics. The NT-URS is required (sold separately).