T&S Faucet Parts Diagram: Repair & Setup 2026
A T&S faucet parts diagram maps the commercial valve assembly, including Eterna or Cerama cartridges, lever handles, seat washers, and tailpiece connections. It illustrates how the cold and hot stem cartridges seat into the brass body, connecting below the sink deck directly to the tailpiece, drain assembly, and P-trap.
📌 Key Takeaways
- T&S Brass cartridges require precise bonnet nut torque (15-20 ft-lbs) to prevent stem packing leaks.
- Identifies critical components including Eterna inserts, seat washers, spring checks, and tailpiece alignment.
- Always shut off angle stops and relieve line pressure before servicing valve bonnets or cartridges.
- Worn stem packing washers and degraded seat O-rings account for over 80% of commercial faucet drips.
- Commercial plumbing hookups require standard 1/2-inch NPT male inlets connecting directly to supply risers.
Commercial food service and facility plumbing operations require precise maintenance standards to prevent costly downtime and health code non-compliance. Deciphering a technical t&s faucet parts diagram is critical when servicing heavy-duty mixing valves, pre-rinse units, and sanitary waste systems. Standard commercial installations integrate high-use brass faucet bodies with robust downstream drainage structures. This includes standard Schedule 40 PVC slip joint connections, specialized tailpiece runs, and properly vented P-trap loops. This technical manual breaks down the internal geometry of T&S faucet assemblies, mapping out component relationships from supply lines down to the secondary waste drain assembly.
T&S Faucet Parts Diagram Component Breakdown and Drain Assembly
According to OEM manufacturer specifications, commercial T&S mixing valves utilize modular internal sub-assemblies engineered to withstand hydraulic line pressures up to 125 PSI and operating temperatures exceeding 180°F. Reading the exploded schematic requires mapping the high-pressure water inlet side down through the control cartridges, body casting, spout, and lower waste discharge circuit.
The primary control engine inside the faucet body consists of either the classic T&S Eterna spindle cartridge or the quarter-turn Cerama ceramic disc cartridge. The Eterna unit uses a spring-loaded brass spindle housing, a renewable Teflon seat washer, and an integrated spring check valve to prevent cross-flow contamination between hot and cold supply lines. Immediately above the body casting sits the bonnet assembly, secured by a packing nut that compresses a rubber spindle O-ring to form a watertight stem seal.
Directly downstream of the faucet outlet, water travels through the rim or deck flange into the fixture sink basin before entering the lower drain assembly. In a complete facility layout, the drain outlet connects to a threaded or flanged 1-1/2-inch tailpiece. This stainless or heavy-gauge brass tailpiece bridges the physical gap between the sink basin strainers and the sanitary sewer piping.
| Diagram Component | OEM Part / Spec Standard | Torque / Dimensional Spec | System Function |
|---|---|---|---|
| Eterna Cartridge Assembly | 002714-40 (RTC) / 002713-40 (LTC) | 15-20 ft-lbs (Bonnet Nut) | Flow/temperature metering with built-in check valve |
| Swivel Nozzle O-Ring Kit | 001074-45 | Dual NBR O-rings (3/4″ ID) | Seals rotating spout connection under dynamic pressure |
| Sink Strainer Drain Assembly | B-0970-1/2 Series | 3-1/2″ Sink Opening / 1-1/2″ NPSM | Captures debris and connects basin to tailpiece line |
| Drain Tailpiece / Slip Joint | Schedule 40 PVC or 17-Gauge Brass | 1-1/2″ Outer Diameter | Directs discharge water to trap loop via compression slip nut |
| P-Trap Sanitary Loop | ASME A112.18.2 / CSA B125.2 | 2″ Minimum Water Seal Depth | Blocks sewer gas back-migration into the facility space |
When replacing T&S spout barrels, ensure the dual split washers (OEM #000843-25) are seated cleanly above and below the elastomeric O-rings. Coat the O-rings exclusively with food-grade silicone grease (NSF 61 certified). Never use petroleum-based lubricants, which cause premature synthetic rubber swell and ring shear within 60 days of installation.
Reading a T&S Faucet Parts Diagram for Full System Rebuilds
System overhauls require tracing fluid flow sequentially through both supply-side components and gravity-fed drain lines. Referring to a technical t&s faucet parts diagram allows facility technicians to quickly isolate worn wear-items from structural housing failures. When servicing heavy-duty commercial sinks, refer to our detailed commercial valve overhaul guide to maintain proper backflow prevention compliance.
- Isolate Hot and Cold Water Lines: Shut off local angle stops beneath the fixture. Depressurize the T&S valve body by opening both lever handles completely.
- Disassemble the Top-Side Control Stack: Remove the index button and handle screw. Lift off the lever handle to expose the stem. Using an adjustable box wrench, loosen the packing bonnet nut counterclockwise. Extract the cartridge assembly from the brass body bore.
- Inspect Internal Seats and Checks: Examine the lower seat surface inside the body. If pitting is observed, replace the renewable seat (OEM #000821-40) using a standard 1/2-inch square seat wrench. Inspect the internal spring check valve within the Eterna cartridge to ensure it snaps closed under spring tension.
- Rebuild the Swivel Base and Aerator: Unscrew the swivel nut at the base of the gooseneck spout. Slide off the lock ring and inspect the split washers. Replace the worn O-rings. Remove the aerator or spray-face spray head, checking for mineral scale buildup or damaged screen meshes.
- Inspect the Waste Tailpiece and Slip Joint Connections: Trace the basin outlet down to the 1-1/2-inch tailpiece. Loosen the upper slip joint nut to check the elastomeric bevel washer. Verify that the PVC or chrome-plated tailpiece is inserted at least 1 inch into the receiving slip joint fitting without bottoming out abruptly against the trap dip.
- Verify Venting Infrastructure: Trace the discharge side of the P-trap to the sanitary tee. Ensure that the branch line connects correctly to an active vertical vent pipe or a properly sized Air Admittance Valve (AAV valve) installed above the flood level rim of the sink fixture, maintaining atmospheric balancing per local plumbing codes. Review our updated sanitary sewer venting protocols for specific pipe pitch tolerances.
When installing an AAV valve (Air Admittance Valve) on a commercial sink drain circuit equipped with high-flow T&S pre-rinse valves (2.2+ GPM), ensure the AAV carries an adequate DFU (Drain Fixture Unit) rating. A undersized AAV will fail to open rapidly under heavy drain discharge, creating a negative pressure spike that siphons the P-trap dry.
Troubleshooting Leakage, Slip Joint Failures, and AAV Venting
High-use commercial kitchens and labs subject plumbing fixtures to thermal shock, hydraulic hammering, and harsh chemical cleaners. Troubleshooting begins by matching specific physical symptoms directly to failure points highlighted on the schematic diagram.
Leaking from the base of the spout barrel usually points to degraded stem O-rings or cracked nylon friction rings rather than a cartridge failure. Conversely, continuous dripping from the spout tip while the handles are off indicates worn rubber seat washers, damaged ceramic discs, or grit lodged in the spring-check valve assembly. For structural valve body leak diagnostics, cross-reference our backflow prevention compliance specs to verify vacuum breaker integrity.
On the drainage side of the system, water pooling inside the cabinet typically stems from a failed slip joint bevel washer or over-tightened plastic slip nuts on Schedule 40 PVC lines. Plastic slip nuts subject to excessive torque can stress-crack across the thread pitch, leading to intermittent leaks during heavy sink discharge cycles. Furthermore, if high-volume discharge from a commercial garbage disposal unit forces wastewater back up through the adjacent sink tailpiece, check for a missing or inverted baffle tee inside the dual-drain tailpiece assembly.
Do not use pipe dope or Teflon tape on compression threads or slip joint bevel washer interfaces. Chemical compounds in thread sealants degrade PVC plastics and EPDM bevel washers, leading to joint slippage, total wall separation, and uncontained facility flooding under thermal expansion.
T&S Faucet Parts Diagram Technical FAQ
How do T&S Eterna and Cerama cartridges differ on the diagram?
The Eterna cartridge utilizes a brass spindle stem with a spring-loaded bottom seat washer, requiring 270-degree handle rotation for full flow. The Cerama cartridge employs dual polished ceramic discs housed in a brass sleeve, operating via a quarter-turn (90-degree) stroke. Cerama cartridges lack spring-check rubber washers, utilizing hard ceramic sealing surfaces that resist thermal degradation up to 200°F.
What torque spec is required for T&S bonnet nuts and tailpiece slip joints?
T&S faucet bonnet packing nuts should be torqued to 15-20 ft-lbs using an adjustable smooth-jaw wrench to prevent brass casing deformation. For lower drainage line connections, hand-tighten plastic PVC slip joint nuts plus 1/4 to 1/2 turn using tongue-and-groove pliers. Heavy-gauge metal slip nuts should be torqued to roughly 10-15 ft-lbs.
How does an AAV valve integrate with commercial T&S drain assemblies?
An Air Admittance Valve (AAV valve) is installed downstream of the P-trap on the vertical branch waste line. When wastewater flows down the tailpiece and through the trap, it creates a localized negative pressure. The AAV valve membrane lifts under this vacuum to admit room air, neutralizing pressure without permitting sewer gases to escape into the kitchen space.
Why is water leaking from the T&S swivel nozzle base during operation?
This leakage occurs when the dual NBR O-rings (OEM #001074-45) inside the swivel joint wear down, dry out, or suffer physical shear from unlubricated rotation. Replacing the O-rings along with the rigid white plastic split washers (OEM #000843-25) eliminates side-to-side play and stops water from bypassing the stem barrel connection under dynamic pressure.
Can a commercial garbage disposal tie directly into a T&S tailpiece line?
Yes, provided a directional baffle tee or dedicated high-impact disposal directional tailpiece is installed. The waste line from the disposal must route through a continuous waist loop or dedicated directional branch to prevent high-velocity food waste slurry from blowing past the main drain line and backing up into the non-disposal sink basin via the secondary slip joint fitting.
Step-by-Step Guide to Understanding the T&S Faucet Parts Diagram
Identify – Locate the specific T&S model number stamped on the faucet body or flange base.
Locate – Isolate water supply lines and reference the T&S faucet parts diagram schematic.
Reference – Match internal parts like the stem cartridge, bonnet nut, and seat washer with callout numbers.
Connect/Route – Reassemble cleaned components and thread the cartridge securely into the brass valve body.
Verify – Turn on supply valves and inspect the tailpiece, drain assembly, and P-trap for leaks.
Troubleshoot – Adjust the bonnet packing nut or check the vent pipe clearance if drainage backpressure occurs.
