Complete the Drainage Run & Control the Discharge

Where will the water go once it reaches the end of the channel? RELN drain end caps & outlets help complete compatible surface-drainage installations by closing the required end or providing a defined connection into downstream stormwater pipework. Starting with the broader RELN range makes it easier to keep compatible drainage components together.

Getting the discharge point right before paving or concrete goes down can save considerable rework later. RELN Storm Drain end outlets connect compatible channels to 90mm stormwater pipe, while the matching end cap closes the high end of the run. Where the drainage point also incorporates a pit, RELN | Aluminium Grates provides options for compatible surface-water pit applications.

Small fittings carry a surprisingly important responsibility in a drainage system. Check the RELN drainage family, channel configuration, outlet position, pipe size plus finished levels before ordering. The goal is simple: collect surface water, contain it within the drainage run plus give it a suitable path towards the intended discharge point.

What Are RELN | Drain End Caps & Outlets?

RELN drain end caps & outlets are finishing components for compatible surface-water drainage systems. An end cap closes the designated end of a channel, while an end outlet provides a connection through which collected water can leave the channel.

Within compatible RELN Storm Drain installations:

► End caps close the high end of the channel
► End outlets create a discharge connection
► Storm Drain end outlets connect to 90mm stormwater pipe
► Fittings locate into designated channel ends
► End caps plus joins can be sealed where specified
► Channels can form part of a wider drainage layout involving pits, grates, corners plus
pipework

The distinction matters because each fitting controls a different part of the water path. One contains the flow at the beginning of the run; the other gives collected water somewhere to go at the discharge end.

For pit installations where the surface cover also needs attention, RELN | Aluminium Grates can help identify suitable grate configurations for compatible RELN pits.

Why Choose RELN | Drain End Caps & Outlets?

A well-laid channel can still disappoint if its ends aren't configured correctly.

Compatible RELN fittings can help:

► Complete a surface-drainage run
► Close the designated high end
► Provide a controlled discharge point
► Connect suitable Storm Drain channels to 90mm stormwater pipe
► Keep fittings within the compatible drainage family
► Support replacement of damaged or missing components
► Simplify planning around the beginning plus end of a channel
► Support suitable residential drainage applications
► Create a more complete connection between surface collection plus downstream drainage

Using fittings intended for the drainage system also removes much of the guesswork around fit. Rather than adapting an unrelated component, identify the RELN channel first plus match the required end fitting to it.

When drainage forms part of larger site works, Commercial Construction provides equipment for the surrounding installation.

Common Applications

Think beyond the fitting itself — the real job is controlling where surface water enters, travels plus leaves.

► Driveway drainage – finish suitable channel runs before connecting collected runoff downstream.
► Garage entrances – complete drainage positioned to intercept surface water approaching the opening.
► Courtyards – close plus discharge suitable channels within paved outdoor areas.
► Pathways – finish compatible linear drainage along pedestrian surfaces.
► Patios – manage runoff around suitable outdoor living areas.
► Residential paving – connect surface collection into compatible stormwater infrastructure.
► Building entrances – complete drainage runs positioned across suitable approach areas.
► Landscape transitions – manage runoff where hard surfaces meet surrounding outdoor areas.
► Property upgrades – replace damaged or missing compatible fittings.
► Drainage extensions – complete additional sections incorporated into an existing compatible system.

The downstream route deserves just as much thought as the visible channel. A clear end outlet won't prevent water backing up if the connected pipework, pit or discharge point is restricted.

Product Selection Guide

End Cap or End Outlet?

Ask what needs to happen at that end of the channel: stop the flow or discharge it?

► End cap – closes the designated end of the compatible drainage channel.
► End outlet – provides a connection for collected water leaving the channel.

RELN's Storm Drain installation arrangement places the end cap at the high point of the channel, while the discharge end directs water towards the downstream connection.

Decide the direction before fixing anything permanently. Reversing the intended layout becomes much harder once surrounding paving or concrete is finished.

Confirm the RELN Drainage System

Similar dimensions don't automatically mean two drainage components belong together.

Before ordering, check:

► RELN drainage range
► Channel type
► Existing markings
► Product code where available
► Required end fitting
► Outlet connection
► Pipe diameter
► Installation direction
► Existing accessories

Use the actual system identification as your starting point. RELN produces different drainage products, so a visual near-match shouldn't replace a compatibility check.

Establish the High & Low Points

Water follows gravity rather than the direction you hoped it would take.

Before excavation or installation:

► Establish finished surface levels
► Determine the channel direction
► Identify the high point
► Locate the discharge end
► Plan the downstream connection
► Check available depth
► Confirm the pipe route
► Account for surrounding paving or concrete

Accurate layout work is easier with suitable Measuring & Layout Tools before cutting, excavation plus permanent placement begins.

Check the 90mm Stormwater Connection

Pipe size becomes critical where the channel hands water over to the underground system.

RELN specifies its Storm Drain end outlet for connection to 90mm stormwater pipe.

Check:

► Correct outlet model
► Pipe diameter
► Pipe alignment
► Available connection depth
► Downstream route
► Required fall
► Applicable installation requirements

Verify the individual component before cutting existing pipework. Not every outlet across every drainage family should be assumed to use the same connection.

Decide Where the Water Will Discharge?

Moving runoff one metre away isn't much help if it simply creates another wet spot.

The end outlet can feed a wider arrangement involving:

► Stormwater pipe
► Drainage pits
► Existing property drainage
► Suitable approved discharge points
► Other compatible stormwater infrastructure

Trace the complete route before starting. Surface collection, channel flow, outlet connection plus downstream capacity all need to work as one system.

Allow for Channel Fall

A nearly level channel can look right while still leaving water sitting where you don't want it.

RELN's Storm Drain installation guidance indicates approximately 30cm of fall over a 20m run.

Also consider:

► Site levels
► Channel length
► Finished paving
► Outlet position
► Downstream drainage
► Applicable installation requirements

Longer runs deserve progressive level checks. Small errors repeated across multiple channel sections can change how effectively water reaches the outlet.

Fit the End Cap at the Correct End

The end cap isn't simply a spare piece for whichever end remains open.

For a compatible Storm Drain installation:

► Position the end cap at the high end
► Make sure it seats correctly
► Seal where specified
► Check alignment before surrounding work is completed
► Keep the fitting clean during installation

Lay out the run before committing to concrete. Seeing the channel, end cap plus discharge arrangement together makes mistakes easier to catch.

Connect the End Outlet Without Strain

An outlet shouldn't have to drag badly aligned pipework into position.

Before completing the connection:

► Confirm the fitting
► Check pipe alignment
► Verify the 90mm connection where applicable
► Make sure the outlet seats correctly
► Keep the connection free from debris
► Check the downstream route

Set the pipework up naturally with the fitting. Unnecessary force at the connection can turn a straightforward installation into a future weak point.

Set the Finished Height Carefully

Too high plus runoff may skirt around the drainage channel instead of entering it.

RELN's Storm Drain installation guidance specifies positioning the top of the grate approximately 2mm below the surrounding concrete or paver surface.

Account for:

► Finished surface height
► Direction of runoff
► Channel alignment
► Grate position
► Concrete surround
► Paver levels
► Future maintenance access

Check finished levels before the surrounding surface becomes permanent. A small height error can affect the way water approaches the channel across the whole run.

Protect the Drain During Concrete Work

Concrete belongs around the correctly positioned drainage system, not inside it.

During installation:

► Protect exposed grates
► Keep outlets clear
► Prevent mortar entering the channel
► Remove loose construction debris
► Keep pipe connections clean
► Check the discharge path before completion

Hand Tools can support measuring, fitting plus general site work around drainage installations.

Test the Water Path

Want the easiest time to discover a problem? Before the first heavy storm.

When appropriate for the installation:

► Inspect the channel
► Check the end cap
► Inspect the outlet
► Confirm pipe connections
► Remove obvious obstructions
► Check that water travels towards the intended discharge point

Follow the test beyond the outlet. Water leaving the channel successfully still needs to continue through the downstream system.

Keep the Outlet Accessible

Buried doesn't have to mean forgotten.

Where practical, plan the installation so important drainage points can still be inspected when maintenance is required.

Watch for:

► Sediment
► Leaves
► Soil
► Construction debris
► Restricted outlets
► Damaged connections
► Signs of water backing up

Access becomes particularly useful when a drainage problem appears years after installation rather than immediately.

Inspect After Nearby Building Work

A drainage system can be working perfectly until another project fills it with debris.

After landscaping, paving, construction or excavation nearby:

► Check channel openings
► Inspect accessible outlets
► Remove loose material
► Look for mortar or soil contamination
► Check surrounding levels
► Inspect for damaged components
► Watch the system during the next significant rainfall

Suitable Safety & PPE should be selected for the cutting, excavation, concrete work or maintenance actually being performed.

Expert Tips

► Map the entire water path first. Know where runoff enters plus where it ultimately needs to discharge.
► Identify the channel system. Don't choose end fittings by appearance alone.
► Place the end cap at the high end. Follow the compatible RELN installation arrangement.
► Confirm pipe diameter early. Storm Drain end outlets connect to 90mm stormwater pipe.
► Measure finished levels before excavation. Surface height influences whether runoff reaches the drain.
► Check fall across longer runs. Small level errors can accumulate over several channel sections.
► Keep fittings clean during installation. Mortar, soil plus concrete debris can restrict flow before the system is used.
► Align pipework naturally. Avoid using the outlet fitting to pull a poorly positioned pipe into place.
► Inspect the downstream route. A clear channel can't compensate for a blocked pipe.
► Lay everything out before concreting. Changes are easier while the components are still accessible.
► Protect visible components during the pour. It saves unnecessary clean-up plus helps keep openings clear.
► Test before relying on rainfall. A controlled flow check can expose obvious installation problems early.
► Watch for ponding after storms. Standing water can reveal level, blockage or discharge issues.
► Recheck after surrounding works. Landscaping plus construction can introduce debris into previously clear drainage.