replacement safety valve r according to the present invention can be inserted into well tubing to replace other types of defective controlled safety valves and respond to the controls of such defective valves to replace such defective valves the safety valve c has a housing h which includes two sections 12 and 13 coupled together at threads 16 and provided with an o ring seal 16a the upper housing section 12 terminates in an adapter 17 having a threaded box 18 for attachment in a tubing string thereabove at the lower end of lower housing section 13 female threads 19 are provided for threaded engagement with male threads 20 on an adapter 21 having external threads at its lower extremity for attachment to a section of the tubing string therebelow one or more set screws not shown are preferably provided to prevent an inadvertent release of the threaded connection 19 20 the wall of the top housing section 12 of the controlled safety valve c fig1 b has a pair of longitudinally formed passages 25 and 25a each terminating in a threaded fitting 26 and 26a for attachment of a hose or pipe 27 and 27a respectively leading to the ground level or surface the passages 25 and 25a and the hoses 27 and 27a convey control fluid to the valve c to control.