Relay, Buchholz, Single-float, Flange 4- hole, Flat, Pipe Dia 25 mm, Suited for transformer ratings ≤1600 KVA,1 cable gland and 1 dummy plug, Damper setting 1.00 ± 15% m/s, one change-over contact, cement-grey, 200 X 205 X 62 mm