Toilet Installation Guide — Universal Procedures by Form Factor

Universal toilet installation — overview

Most US toilet installs follow standard procedures regardless of brand. This guide covers the 6 form factors and their specific requirements.

Tools required (universal)

• Adjustable wrench (8-10 inch)
• Channel-lock pliers
• Screwdriver set (Phillips + flathead)
• 4-foot level
• Bucket + sponge
• Hacksaw (for corroded tank-bowl bolts on replacements)
• Putty knife (for wax ring scraping)
• Caulk gun + clear silicone (optional for base sealing)

Materials checklist

• Wax ring: Korky 6000 or Fluidmaster 7530 ($5-$10) — typically NOT included with toilet
• Floor flange bolts: typically reusable from existing install; replacement set $3-$5
• Supply line: 12-inch braided stainless steel ($5-$10) — replace as preventive maintenance
• Tank-to-bowl gasket: usually included with toilet (Eljer requires wider 091-7355 pattern)
• Toilet seat: typically sold separately ($25-$90 depending on grade)
• Setting compound: Korky setting compound ($6) for one-piece on out-of-level floors

Install time by form factor

Standard two-piece install procedure (most US toilets)

1. Shut off water at the under-toilet shutoff valve
2. Flush old toilet to empty — hold handle down to fully drain
3. Disconnect supply line from bottom of tank (channel-lock pliers)
4. Remove tank-bowl bolts from inside the tank (Phillips screwdriver from above + wrench from below)
5. Lift old tank up off the bowl
6. Remove floor flange bolt caps + nuts at the base of the old bowl
7. Lift bowl off the wax ring — gentle rocking if stuck
8. Scrape old wax ring off the floor flange (putty knife, wear gloves)
9. Inspect floor flange for damage; replace if cracked
10. Install new wax ring on floor flange (horn-side down)
11. Set new bowl on flange. Press straight down. Verify plumb with level.
12. Install flange bolts through bowl base. Hand-tighten only.
13. Install tank-to-bowl gasket on flush valve outlet (bottom of tank)
14. Set tank on bowl, aligning gasket with bowl mounting opening
15. Insert tank-bowl bolts. Cross-tighten alternately, 1/4 turn at a time, until snug.
16. Connect supply line to bottom of tank. Hand-tighten + 1/4 turn.
17. Turn shutoff valve on. Tank fills.
18. Test flush 3-5 times. Check for leaks at base, tank-bowl joint, supply line.
19. Install seat (sold separately)
20. Optional caulk around base perimeter

One-piece install — additional considerations

• Two-person lift required — one-piece bowls are ~90-100 lbs single unit
• NEVER twist during placement — twisting cracks one-piece porcelain
• Floor must be flat — apply setting compound around perimeter if not
• Wax ring with horn recommended for one-piece bowl outlet geometry
• Floor flange at or below floor level for skirted-trapway models

Wall-hung install — additional requirements

• In-wall carrier required — Geberit Sigma ($480-$680), Zurn Z1203/Z1204 ($240-$420), or Jay R. Smith equivalent
• Carrier embedded during construction OR significant retrofit (wall opening)
• Wall structure must support combined 700+ lb load
• Concealed tank service access via actuator plate removal
• Bowl height adjustable via carrier mounting position (typical 16-18" finished height)

Commercial flushometer install

• Commercial plumber required — building-grade water supply + flushometer infrastructure
• 1" supply line stub-out at 16-18" above floor
• 25 PSI minimum supply pressure (verify before install)
• Flushometer valve sold separately — typically Sloan Royal 111, Zurn Z6000, or Moen 8312 ($160-$340)

Macerator/upflush install (Saniflo)

• Electrical required: 110V outlet within 6 ft, dedicated 15-amp circuit (20-amp for heavy-duty models)
• Discharge pipe routing: 3/4" PVC (or 1" for heavy-duty), up to 15 ft vertical OR 150 ft horizontal
• Air admittance valve (AAV) venting required
• Plumber + electrician recommended for first-time install

Common universal install mistakes

• Wax ring not purchased — most toilets ship without wax ring
• Tank-bowl bolts overtightened — cracks porcelain. Snug + 1/4 turn limit.
• Floor flange bolts overtightened — cracks bowl porcelain at base
• Old supply line reused — replace at install as preventive maintenance
• Toilet wobble ignored — damages wax ring within months; tighten flange bolts or use shims
• One-piece installed on out-of-level floor — porcelain cracks at unsupported edge
• Brand-specific gasket substituted — Eljer wider gasket cannot be replaced with standard 3-inch