A.O. Smith gas valve: original A.O. Smith spare part, type: Gas valve. Application: Hot water cylinder (ADM(C) 40). Manufacturer number: 0300903(S); Instalpunt article number: 8750266.
According to the A.O. Smith parts lists, this part fits 14 models, including A.O. Smith ADM(C) 40, A.O. Smith ADM(C) 50 and A.O. Smith ADM(C) 60. The full list is under “Fits”.
This item is in stock and usually arrives within 3–5 working days.
Check the rating plate of your appliance before ordering; if in doubt, ask the manufacturer or your installer.

