How to Install or Replace a Transom Shower on Your Boat
Signs Your Transom Shower Needs Replacing
Transom showers live in a tough spot: constant sun, salt spray, and people yanking the hose after a swim. Common failures include a hose that won't retract, a cracked housing or door, a latch that no longer holds, a valve that drips, or a sprayer head that's corroded shut. If your unit leaks into the hull or won't shut off, replace it before it turns into water damage.
Choose the Right Replacement
- Cold only or hot and cold: If your boat has a water heater, a hot-cold transom shower with latch gives you a proper rinse. Otherwise a cold-only transom shower keeps things simple.
- Cutout size: Measure the existing opening width, height, and depth behind the panel. Choosing a unit with the same or slightly larger flange avoids cutting new fiberglass.
- Space-saving options: The Stowaway Compact Shower, Stowaway Transom Shower, and Stowaway Ultimate Cockpit Shower tuck the hose and head away cleanly when not in use.
Browse all options in our Transom Showers collection, or grab individual shower parts if only the hose or head has failed.
Tools and Materials
- Replacement shower unit
- Screwdriver or drill
- Putty knife and plastic scraper
- Marine sealant (a removable one like 3M 4000UV or 4200 is a good choice)
- PTFE tape and stainless hose clamps
- Acetone or isopropyl alcohol
- Towels and a bucket
Step 1: Shut Off the Water
Turn off the freshwater pump at the breaker and open a faucet to relieve pressure. If you have a water heater, turn it off and let the water cool before disconnecting a hot line.
Step 2: Remove the Old Unit
Access the back of the shower from inside the hull or storage compartment. Disconnect the supply line(s), keeping a towel handy for residual water. Remove the mounting screws, then work a putty knife behind the flange to break the old sealant. Pull the unit out slowly.
Step 3: Prep the Opening
Scrape off all old sealant and clean the surface with acetone or alcohol. Test-fit the new unit. If the cutout needs enlarging, mark it with the unit's template and trim carefully with a jigsaw or rotary tool. Seal any exposed fiberglass or core edges.
Step 4: Connect the Plumbing
Attach the supply line to the new valve using the correct hose barb adapter. Wrap threads with PTFE tape and secure hose with stainless clamps. Unsure of your sizes? See our hose barb and pipe thread size guide. For hot-cold units, double-check which line is hot before connecting.
Step 5: Seal and Mount
Run a continuous bead of marine sealant around the back of the flange and on each screw hole. Press the unit into place, install the screws snug but not overtight, and wipe away squeeze-out.
Step 6: Test for Leaks
Turn the pump back on and run the shower. Check the connections inside the hull and around the flange for drips. Pull the hose out and let it retract several times to make sure it moves freely and the door or latch closes properly.
Winterizing Tip
If you store your boat in a cold climate, drain the shower line or run non-toxic antifreeze through it during winterization. Trapped water can freeze and crack the valve. Questions about fit? Email info@replacementboatparts.com with a photo of your current unit and its cutout size.