SPRING, VALVE: VALVE SIZE 4 X P2 X 6 IN, FFT:WITH WASHER AND THRUST WASHER; FOR SUPERHEATER SAFETY VALVE & BOILER - SAFETY VALVES; MODEL# SERIAL # HCI 46 16510-002-1 HCI 46 16510-003-1 HCI 46 16510-002-2 HCI 46 16510-003-2 HCI 46 16510-002-3 HCI 46 16510-003-3 HCI 46 16510-002-4 HCI 46 16510-003-4; EQUIPMENT# PSV-100 PSV-101 PSV-200 PSV-201 PSV-300 PSV-301 PSV-400 PSV-401; MANUFACTURER: CROSBY VALVE & GAGE CO. CROSSBY ROAD, MARKET HARBOUROUGH LEICS, LE16 9EE, ENGLAND; PHONE# 0044-1858-467281; FAX# 044044-1858-434728, MNFR: CROSBY VALVE & GAUGE CO. MNFR PART NO: UNKNOWN, MNFR: MACCHI S.P.A MNFR PART NO: UNKNOWN, DRAWING 16510 CP2 REV: 0 ITEM NO: 13-14,15-17