supply and installation of bis listed semi automatic stainless steel preve ntive device with ul approved clean gas with auto manual reverse stainless steel v alve nasa 200 mar having capacity 02 kgs and made of stainless steel 304 grade with i ndian railways logo each unit and as per specification attached make model offe red nasa 200 mar cm l no 7200017592 is 158683 2018 15683 2018 warranty period 30 months afte r the date of delivery