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Some water heater manufacturers who bought their water heater dip tubes from Perfection Mfg. Co. between 1993 and 1997 sold water heaters with potentially faulty dip tubes.  The problem stems from the deterioration of the plastic dip tube inside the tank, and the subsequent problems from the plastic pieces washing through the water system and eventually causing reduced water pressure.  The resulting class action law suit provided for 100% replacement costs for replacing the defective tube, however the claim period terminated 12/31/2000. 

It is important however to recognize if your water heater falls into the range of those having a potentially defective dip tube.  Below is a list of water heater manufacturers and the serial # range for those with the defective part.  If yours falls in this range it would be advisable to have a licensed plumber replace your water heater's dip tube.

TANK
MANUFACTURERS
SERIAL
NUMBER RANGES
American 9332****** to 9712******
  *Water heaters manufactured by American Water Heater Company and purchased at Lowes do not contain Perfection Dip Tubes and are not covered by the settlement. Water heaters manufactured by American Water Heater Company and sold by Home Depot under the brand name, "MOR-FLO", also do not contain Perfection Dip Tubes and are not covered by the Settlement.
A.O. Smith *H93****** to *C97******
Bradford White KH******* to KM*******
LA******** to LM*******
MA******* to MM*******
NA******* to NM*******
and OA, PA, or PB
Lochinvar KH******* to KM*******
LA******** to LM*******
MA******* to MM*******
NA******* to NM*******
and OA, PA, or PB
Rheem 0893****** to 0397******
0599A**** to 0599F****
State Industries For State Model numbers beginning with PRX-75, PRX-100, PRV-75 and PRV-100, and Reliance Model Numbers beginning with 5-75 or 5-100, the eligible serial number ranges are as follows:

G93******* to M93*******
A94******* to M94*******
A95******* to M95*******
A96******* to M96*******
A97******* to F97*******

All State and Reliance brand water heaters with serial numbers beginning with B95, C95, D95 and E95 are also eligible to receive benefits under the Settlement.

All Sears Kenmore products, any water heaters with the words "Turbo", "Sta-Kleen", or "Self Cleaning", water heaters with cold water inlets on the side of the water heater, and water heaters with model numbers with the letter "Z" or letters "NC" at or near the end of the model number are EXCLUDED from the Settlement and do not contain Perfection dip tubes.