Replace a Shower Valve Cartridge and Trim

A. Finished-Project Specification

Quantity: one shower valve, restored with one exact manufacturer-matched replacement cartridge and seals, reassembled with its original trim, and documented on one completed Cartridge Replacement Record.

B. Cartridge Replacement Readiness Schedule

Item	Target Condition	Verification Method
Valve identification	Manufacturer, model, and cartridge number confirmed against the physical valve before parts are ordered	Written record on Cartridge Replacement Record
Isolation	Hot and cold water shut off and verified at the valve	Direct observation; no flow at the valve outlet
Trim and orientation record	Handle position, trim orientation, and temperature-limit setting photographed before removal	Photograph review before disassembly
Cartridge extraction	Cartridge removed using only the manufacturer-approved puller or method, valve body undamaged	Visual inspection of valve body after removal
Cartridge installation	New cartridge installed in exact recorded orientation, retainer fully engaged	Visual and mechanical confirmation of retainer engagement
Temperature and leak test	Correct shutoff, hot-cold orientation, and temperature response confirmed; no leakage at valve body or trim	Direct flow and temperature test with thermometer

C. Material Takeoff

• Replacement cartridge: one exact manufacturer-approved cartridge matching the confirmed model and cartridge number.
• Seal kit: manufacturer-approved seals sized for the confirmed cartridge and valve body.
• Lubricant: manufacturer-approved lubricant for new seals only; no substitute lubricant.
• Documentation: one Cartridge Replacement Record per project, plus photographs of handle position, trim orientation, and temperature-limit setting before disassembly.

D. Acceptance Standards

Check	Standard
Valve identification	Manufacturer, model, and cartridge number confirmed against the physical valve and matched to the installed replacement
Isolation verification	No flow or pressure at the valve outlet after shutoff, confirmed by direct observation before trim removal
Cartridge orientation	Installed orientation matches the recorded original orientation exactly, confirmed before retainer installation
Retainer engagement	Retaining clip, nut, or plate fully seated and confirmed by the manufacturer's engagement check
Temperature-limit setting	Maximum outlet temperature measured and limit stop set to the approved maximum using a thermometer
Leak test	No leakage at the valve body, cartridge seal, or trim under static and operating conditions
Documentation	Cartridge Replacement Record complete with valve identification, orientation, and final limit-stop setting

E. Valve Identification and Shutdown

1. Identify the valve manufacturer, model, cartridge number, trim compatibility, retaining method, and temperature-limit procedure. Confirm this information against the physical valve, not from memory or a similar-looking model.
2. Confirm that the replacement cartridge and seals are exact approved components. Do not proceed if the cartridge number cannot be confirmed against the physical valve.
3. Shut off hot and cold water and verify complete isolation at the valve. Confirm no flow or pressure remains at the valve outlet before continuing.

F. Work-Area Protection and Trim Documentation

1. Protect the tub or shower surface and cover the drain. Confirm protection is in place before any tool contacts the finished surface.
2. Photograph handle position, trim orientation, and existing temperature-limit setting. Confirm the photographs clearly show orientation marks before disassembly begins.

G. Trim Removal and Valve-Body Inspection

1. Remove handle, escutcheon, sleeve, and trim components using the specified tools. Set fasteners aside in the order removed.
2. Inspect the valve body for leakage, corrosion, movement, missing access, and evidence of concealed water damage. Treat any of these conditions as a stop-work condition requiring escalation before continuing.

H. Cartridge Extraction

1. Remove the retaining clip, nut, plate, or other approved cartridge retainer. Set the retainer aside for reuse or replacement as specified.
2. Note cartridge orientation before extraction. Confirm the recorded orientation matches the manufacturer's index marks.
3. Use the manufacturer-approved puller or removal method without twisting or damaging the valve body. Apply steady, controlled force only as directed by the puller instructions.
4. Stop work if the cartridge is seized beyond the approved method, the valve body moves in the wall, or the body is cracked or severely corroded. Escalate per the Failure Points section before continuing.

I. Bore Preparation and Cartridge Installation

1. Clean the valve bore using only approved materials. Remove mineral deposits and debris without scratching or damaging the bore surface.
2. Lubricate new seals only with the manufacturer-approved lubricant. Apply lubricant evenly to the seal surfaces before insertion.
3. Align and insert the cartridge in the exact hot-cold and top-bottom orientation. Confirm alignment against the recorded orientation before seating the cartridge fully.
4. Reinstall the retainer and verify full engagement. Confirm the retainer seats completely using the manufacturer's engagement check.

J. Initial Water Restoration and Function Test

1. Temporarily install the handle or test adapter. Confirm the adapter engages the cartridge stem correctly before restoring water.
2. Restore water slowly while the wall access remains open. Watch the valve body continuously during initial restoration.
3. Inspect the valve body and cartridge seal for leakage. Correct any leakage found before proceeding to functional testing.
4. Test shutoff, flow, hot-cold orientation, pressure-balance or thermostatic response, and temperature range. Confirm each function operates as the manufacturer describes for this model.
5. Set the temperature-limit stop to the approved maximum using measured outlet temperature. Use the thermometer to confirm the outlet temperature at the limit-stop setting.

K. Trim Reinstallation and Final Verification

1. Shut off water again if trim components require dry assembly. Confirm isolation before removing the temporary handle or test adapter.
2. Install the escutcheon seal, sleeve, handle, and remaining trim without blocking designed drainage openings. Confirm no trim component obstructs a drainage or pressure-relief opening in the escutcheon.
3. Apply sealant only where directed by the trim manufacturer. Do not apply sealant to surfaces the manufacturer does not specify.
4. Perform final flow, temperature, shutoff, and leak tests. Confirm all functions meet the Acceptance Standards table before closeout.
5. Document cartridge identification and final limit-stop setting. Complete every field on the Cartridge Replacement Record.