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Go to www.americanhvacparts.com Type GSV700402A in top right corner. Russ
It is 1/2 in and out. The old valve says 7000 BER-S7B, 24vac, 0.2amp 12vdc ,0.18amp
other info is 403-501-577 and 812826-01
It is a 75,000 btu Rheem furnace natural gas approx. 20-21 years old.