We're really sorry... ...we don't currently have that one in stock Please add your email and we'll notify you when it's back AO SMITH 100049890:PORT OBSERVATION WINDOW, 1.50" DIAMETER-PYREX (replaces 191572-1) (Back to product) Home » Parts » Water Heater Parts » AO Smith Parts See More Products Like this One (5828 Items) No Product Image A. O. SMITH 100049890 Product ID: 53900 AO SMITH 100049890:PORT OBSERVATION WINDOW, 1.50" DIAMETER-PYREX (replaces 191572-1) $16.50 Qty To ensure the correct part, please enter the manufacturers name, model and serial number of your heater: Description Email Friend Ask a Question About this Product Return Policy | Shipping Policy « Previous | Next »