Parts
Plumbing parts: a model number in, the part that fits it out, with the cross-fit alternatives and the spec sheet that says so.
Each parts page starts from a model number and ends at the component that fits it, with the cross-fit alternatives named and the manufacturer document that establishes the fit cited.
Toilets, faucets and showers 7 pages
Match
Kohler Rite-Temp Cartridge: GP800820 vs GP77759
Kohler's parts pages: GP800820 is the cartridge for K-304 and K-11748, GP77759 is only the mixer cap, GP800881 fits K-8304. Ask about Kohler's warranty first.
Match
Toilet Rough-In: Measure 10, 12 or 14 in, by Model
Rough-in is finished wall to the centre of the closet bolts (TOTO), near 10, 12 or 14 in; 12 in is standard. Model numbers by rough-in from maker spec sheets.
Match
Toilet Seat Size: Round vs Elongated, Measured
Measure two things: 5 1/2 inches between bolt-hole centres, then midpoint to front rim. About 16 1/2 inches is round, about 18 1/2 inches is elongated (Bemis).
Match
Delta Cartridge by Model: RP46074 vs RP19804
Delta's parts pages: RP46074 for MultiChoice 13/14 after March 2006, RP19804 before, RP32104 for Monitor 17, RP50587 for DST sinks. Delta may ship it free.
Match
Toilet Fill Valve by Model: 400H, 400A, Korky 528
Match a fill valve to the overflow tube, not the brand: Fluidmaster 400H adjusts 9 to 14 inches, Korky 528MP 8-1/2 to 14, water 1/2 inch below the overflow top.
Match
Toilet Flapper 2 Inch vs 3 Inch by Model
Measure the old flapper: 3 inches across means a 2-inch flapper, 4 inches means a 3-inch one. Kohler canister and American Standard Champion 4 tanks take a seal.
Match
Moen Cartridge 1225 vs 1222 vs 1200: Which Fits
Moen's support index: 1225 for pre-2009 single-handle faucets and Moentrol showers, 1222 for Posi-Temp, 1255 after 2009, 1224 for two-handle. Moen may ship it free.
Water heaters 4 pages
Match
Water Heater Thermocouple or Thermopile: By Type
Standing-pilot tanks take a 30 mV Honeywell CQ100A thermocouple, 18 to 36 in. Status-light tanks run a 750 mV thermopile; FVIR makers sell the pilot as one assembly.
Match
Water Heater Element by Wattage and Voltage
Match the rating plate: same voltage, no greater wattage (A.O. Smith). Camco screw-in elements: 1 in NPS thread, 1-1/2 in hex; 4500 W at 240 V is ProLine standard.
Match
Thermal Expansion Tank Cross-Reference by Model
Amtrol ST-5, Watts PLT-5, Zurn XT-8 and TW 5-1 fill the 2-gallon slot; ST-12, PLT-12, XT-18 and TW 12-1 the 4.5. All 3/4 in NPT, 150 psi, precharge 20 to 50 psi.
Match
Water Heater Anode Rod by Model: Thread and Size
Residential anode rods are 3/4 inch NPT with a 1-1/16 inch hex head. Rheem publishes 42, 44, 54 and 58 inch rods; Bradford White cuts segmented rods to length.
Pipes and freezing 2 pages
Match
Pipe Insulation Size by Pipe Diameter
Foam sleeves fit the pipe's outside diameter. Copper Tube Handbook: 1/2 in copper is 0.625 in OD, 3/4 in is 0.875 in; PEX matches; 1/2 in iron pipe is 0.840 in.
Match
Frost-Free Sillcock Length by Wall Thickness
Woodford 17, 19, 27 and Prier C-144 ship in wall thicknesses from 4 to 24 inches in 2 inch steps; Sioux Chief stops at 12. Order by wall, not overall length.
Drains and disposals 1 pages
Match
InSinkErator Model Cross-Reference by Series
InSinkErator comparison chart: 11 current models by HP, grind stages, sound, cord and warranty, plus Quick Lock interchange, serial tag and reset button.