CSLB C-36 Plumbing ContractorRough-in PlumbingHard
A plumbing contractor is installing a new water supply system for a multi-story building. To provide a branch connection from an existing copper main without interrupting service or making a full cut, the contractor considers using a saddle tee. For what type of piping material is a saddle tee generally NOT permitted for potable water branch connections?
- ACopper pipe
- BPEX pipe
- CCPVC pipe
- DGalvanized steel pipe
Show answer & explanationAnswer & explanation
Correct answer: D. Galvanized steel pipe
Saddle tees are generally prohibited on galvanized steel pipe for potable water due to the risk of accelerated corrosion at the penetration point, potential for leaks, and accumulation of rust and scale, which can contaminate the water and reduce flow.
Why the other options are wrong
- A. Saddle tees designed for copper are allowed under specific conditions (e.g., for irrigation, not typically for potable interior branches).
- B. Saddle tees are not typically made for PEX, as PEX is usually connected with crimp or expansion fittings.
- C. Saddle tees are not typically made for CPVC, as CPVC is usually connected with solvent cement or threaded fittings.
Saddle Tee Prohibition
Situations or materials where saddle tees are specifically disallowed for plumbing connections, particularly for potable water.
- Prevents leaks and material degradation.
- Ensures long-term system integrity.
- Often prohibited on certain pipe types due to corrosion or structural weakness.
Memory trick: Saddle tees are quick, but on galvanized, they'll make your water sick.