Tender For supply of thermostatic expansion valve equivalent to model no. tube 9 ang type (0681u2075) of danfoss make suitable for r22/r407c refrigeration system in lhb ac coaches as per rdso spec no. rdso/pe/spec/ac/0061-2005 (rev.1). make- danfoss or alco or sporlan or any other make with prior approval of rdso.