Every answer a plumber needs. Indexed, illustrated, instant.
Pipe sizing charts, code lookup tables, fixture rough-in dimensions, and troubleshooting flowcharts — everything that used to live in a dog-eared UPC book, now cross-referenced in seconds.
Copper to PEX Transition Fitting
Mechanical press connections permitted where listed for the application. Minimum 1/2" male adapter with ASTM F1960 expansion ring.
PEX Supply Line Rough-In
Hot: 21" AFF center · Cold: 17" AFF center · Spacing: 4" O.C. · Stub-out: 6" min from wall plane.
Why PEX Fittings Restrict Flow
Insert-style crimp fittings reduce bore by 20–30%. Use expansion (F1960) or push-fit (F2080) for equivalent full-port flow.
Knowledge Base
Six categories.
Every plumbing answer.
Hover any card to preview a real entry. These aren't summaries — they're the actual data you'll use on the job.
Codes & Standards
IPC, UPC, NSPC — jurisdiction-specific code references with section numbers and amendment dates.
IPC §708.1.2 — Cleanout Access
Cleanouts shall be installed at each change of direction greater than 45°, at the base of each stack, and at intervals not exceeding 100 ft (30 480 mm) for 4-inch and smaller drain lines.
Fixture Data
Rough-in dimensions, supply heights, drain locations, and ADA clearances for every standard fixture.
Water Closet — Floor-Mount
Rough-in: 12" std (10" or 14" available) · Supply: 6–8" AFF, 6" left of CL · Drain CL to wall: 12" · Min side clearance: 15" to obs.
Pipe Sizing
Friction loss tables, DFU load charts, pressure drop calculators, and velocity limits for copper, PEX, CPVC, and cast iron.
2" ABS/PVC Drain — Fall Per Foot
1/4" per foot (2.08%) standard grade · Min: 1/8" per foot (1.04%) · Max: 1/2" per foot (4.17%) before self-scouring issues. Verify with AHJ.
Troubleshooting
Decision-tree diagnostics for low pressure, slow drains, water hammer, thermal expansion, and backflow events.
Low Pressure — Single Fixture
Step 1: Measure static vs. flowing PSI at fixture. Step 2: Check aerator/cartridge restriction. Step 3: Verify supply valve fully open. Step 4: Test line pressure at angle stop.
Tool Specs
Torque specs, press jaw sizing, crimp ring dimensions, and inspection criteria for every common plumbing tool.
PEX Crimp Ring — 1/2" CTS
Ring OD: 0.850" · Crimped OD: 0.690"–0.710" · Go/No-Go gauge required. Jaw rotation: ±5° from perpendicular. ASTM F1807 compliance.
Exam Prep
Practice questions mapped to journeyman and master plumber exam blueprints, with code citations for every answer.
Master Exam Q — Trap Seal
Min trap seal depth for floor drain in a building trap installation: 2 inches (50.8 mm). Trap seal primer required if drain subject to evaporation.
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Code Reference Lookup
IPC, UPC, NSPC sections
Pipe Sizing Charts
DFU tables, friction loss
Fixture Rough-In Data
Dimensions & clearances
Troubleshooting Flowcharts
Step-by-step diagnostics
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Exam Prep Module
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From the Trades
Real people. Real job sites.
I was studying for my master's exam at 11:30 PM and needed to verify the trap arm length-to-diameter ratio for a 3-inch line. Valve had the IPC table, the exception clause, and a worked example — in one result. That's three tabs I didn't have to open.
Derek Callahan
Journeyman Plumber
Chicago, IL · 9 years in trade
A tenant called about low pressure in unit 4B. I pulled up Valve, ran the diagnostic tree for single-fixture low pressure, and had a checklist to walk the super through before I even called my contractor. Saved a $200 service call — the angle stop was just partially closed.
Priya Nambiar
Property Manager
Austin, TX · 22-unit residential portfolio
I assign Valve to every first-year apprentice on day one. Instead of asking me what the fall is on a 2-inch drain line for the fourth time that week, they look it up, read the code citation, and remember it. The pipe sizing charts alone are worth the subscription.
Marcus Okafor
Plumbing Instructor
Tri-County Trade School · 14 years teaching
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