Solid Covers for Secure Drainage Pit Access

Some drainage pits need to collect water from above. Others simply need to stay covered, accessible & protected. RELN Pit Checker Plates suit that second requirement, providing solid galvanised steel covers for compatible RELN pit systems where an open grate isn't the right surface.

Replacement buyers should start underneath the cover, not with the checker pattern on top. Pit series, cover dimensions, load class, surrounding surface & traffic exposure determine the correct fit. RELN | Drainage & Pits helps identify the supporting drainage family, while RELN covers the broader system when the job also involves pits, risers or related drainage components.

That makes checker plates a very different purchase from ordinary stormwater grates. Their job is to maintain access to the pit while creating a solid top surface, so buyers need to establish whether the location actually requires a covered access point before selecting one.

What Are RELN Pit Checker Plates?

RELN Pit Checker Plates are solid galvanised steel covers manufactured for nominated RELN drainage pit families.

Unlike an open grate, the checker plate doesn't intentionally admit surface runoff through openings across its face. Instead, it provides a removable solid cover over compatible drainage infrastructure.

Depending on the pit system, RELN checker-plate options include:

► Series 300 Class A checker plate
► Series 410 Class B checker plate
► Series 450 Class B checker plate
► Series 600 checker-plate configurations
► Cover-only replacement products
► Domestic & light-commercial options
► Commercial pit-cover options

Each cover should be treated as a system-specific component. Similar appearance doesn't mean two checker plates share dimensions, compatibility or load classification.

Why Choose RELN Pit Checker Plates?

A solid cover makes sense when access is required but another opening for leaves, gravel & surface debris isn't.

Depending on the specific pit & cover, RELN checker plates can provide:

► Solid pit coverage
► Removable maintenance access
► Galvanised steel construction
► Replacement cover options
► Class A or Class B configurations
► Compatibility with nominated RELN pit systems
► Reduced direct entry of larger debris through the pit top

The load class is product-specific. RELN's Series 300 galvanised checker plate is Class A, while Series 410, Series 450 & Series 600 commercial pit ranges include Class B checker-plate options.

That difference matters far more than the fact every cover carries a raised checker pattern.

Common Applications

Picture a maintenance access point beside a warehouse where underground drainage needs periodic inspection, but runoff is already captured by channels elsewhere. A solid checker plate can keep that pit covered without creating another open surface inlet.

Other appropriately specified applications can include:

► Drainage junction points
► Service yards
► Commercial property maintenance areas
► Residential drainage access points
► Paved utility areas
► Light-vehicle locations where the specific rating permits
► Plant & facility access areas
► Covered stormwater pits

Property managers often face the opposite buying situation: the pit is already installed & functioning, but its original cover has been damaged or removed. Here, the task isn't redesigning the drainage network. It's accurately identifying the pit & replacing the cover without creating a fit or load-class problem.

Contractors working on new external works need to think one stage further ahead. Pit height, surrounding concrete, pipe levels, future maintenance access & vehicle routes should all be settled before the finished surface locks the installation into place.

Product Selection Guide

Decide Whether the Pit Should Be Open or Covered

Start with the water path.

If runoff needs to enter directly through the top of the pit, investigate an open grate.

If the pit is primarily an access, junction or inspection point & surface entry isn't required there, a solid checker plate may be more appropriate.

Choosing between the two is a drainage-design decision before it becomes a product decision.

Identify the Pit Family Before Measuring Alternatives

RELN checker plates aren't generic sheets intended to sit over any similarly sized opening.

Confirm the existing pit family, including whether you're dealing with:

► Series 300
► Series 410
► Series 450
► Series 600
► Another compatible RELN system

Where the requirement is specifically for another closed-cover format, RELN | Pit Solid Lids provides the closest direct comparison.

Understand the Series 300 Checker Plate

Series 300 buyers are dealing with a different specification from RELN's larger commercial checker plates.

RELN currently lists the Series 300 galvanised checker-plate cover as:

► Product code 001087
► 330 x 330 x 20mm
► 3.5kg
► Galvanised steel
► Class A
► Designed for the Series 300 Traditional Pit

RELN positions this product for residential & light-commercial applications.

Don't transfer that Class A specification to the larger checker-plate families.

Step Up to Commercial Pit Families Deliberately

A larger commercial pit changes more than the cover dimensions.

RELN's commercial range includes:

RELN currently identifies Series 410, 450 & 600 commercial pit families with Class B checker-plate options.

Select the pit family around drainage capacity, site requirements & compatibility rather than assuming bigger automatically means better.

Understand What Class B Actually Changes?

Traffic terminology can become misleading when “commercial” is treated as one universal condition.

RELN's load table identifies Class B with areas accessible to vehicles other than commercial vehicles, including light tractor paths or livestock areas. Class C is the next classification used for areas open to slow-moving commercial vehicles.

That means buyers should establish:

► What vehicles use the area
► Where their wheels actually travel
► Whether commercial vehicles cross the cover
► Required project specification
► Installation conditions

A Class B checker plate shouldn't be casually promoted as a substitute for a Class C drainage product.

Compare Iron Grates When Traffic Requirements Increase?

A site requiring an open drainage surface & a different traffic classification has moved beyond the checker-plate decision.

RELN | Iron Grates provides the relevant comparison for RELN ductile-iron Class C drainage configurations.

Material follows function & load requirement — not the other way around.

Use Galvanised Grates Where the Pit Must Collect Runoff?

If rainwater is supposed to enter through the pit top, closing it with checker plate defeats that part of the drainage design.

RELN | Galvanised Grates provides open grate options across compatible RELN systems.

Before choosing either product, watch what happens during rainfall:

► Where does runoff travel?
► Does water converge at the pit?
► Is another channel already collecting it?
► Would covering this opening create ponding?

The correct cover becomes much clearer once the actual water route is understood.

Account for Pit Height Before Finishing the Surface

The right checker plate on a pit sitting 30mm too low still produces a poor finished result.

Check:

► Existing pit height
► Concrete or paving thickness
► Final surface level
► Pipe connection levels
► Required access

Where compatible height adjustment is required, RELN | Risers provides the logical supporting category.

Set the pit first. Fit the cover to the finished installation second.

Consider Debris Arriving From Somewhere Else

A solid cover can reduce direct entry through the top without making the chamber debris-proof.

Leaves, sediment & other material can still arrive through connected drains or upstream inlets.

Where interception is required elsewhere in the RELN system, RELN | Drain Guards can support that part of the maintenance plan.

Inspect the network, not merely the clean-looking checker plate.

Measure a Replacement at the Seating Points

An approximate pit opening isn't enough information for a replacement order.

Record:

► Existing cover length
► Width
► Thickness
► Supporting ledge
► Clear opening
► Pit-series markings
► Product code where visible
► Load classification

Photograph the pit both with & without the cover where safe.

Fit should be confirmed against the intended RELN system rather than inferred from a tape measure alone.

Inspect What Supports the Cover?

A fresh galvanised checker plate won't correct a cracked pit edge or unstable surrounding slab.

Look for:

► Damaged seating surfaces
► Cracked pit edges
► Concrete deterioration
► Movement
► Debris beneath the cover
► Distortion
► Signs of repeated impact

If the support is compromised, investigate the underlying problem before treating the cover as the repair.

Check Real Wheel Paths

A vehicle-accessible yard doesn't mean every square metre experiences the same loading.

Observe:

► Entry & exit lines
► Turning arcs
► Parking positions
► Trailer paths
► Forklift or plant routes
► Service access

The exact position of the pit can materially change the loading conversation.

Leave Room for Future Maintenance

The checker plate is removable for a reason.

Keep the cover accessible for:

► Sediment inspection
► Pipe maintenance
► Blockage investigation
► Repairs
► Pit cleaning

Avoid trapping the cover beneath:

► Permanent edging
► Fixed equipment
► New paving
► Landscaping features
► Stored materials

Good drainage access is access that still works five years after installation.

Plan for Larger Cover Handling

Commercial checker plates quickly become substantial components.

RELN lists its Series 600 Class B checker plate at approximately 685 x 685 x 50mm & 24.78kg.

Before maintenance:

► Assess the lift
► Clear the surrounding area
► Protect hands & feet
► Have a stable location ready for the removed cover
► Use suitable handling methods

Don't wait until the pit is blocked to discover the cover is awkward to remove safely.

Keep Construction Debris Out Before Commissioning

New pits can become dirty before they've carried their first proper storm.

Concrete slurry, sand, aggregate, soil & offcuts can enter while the cover is removed during surrounding works.

Site Essentials & Jobsite Gear can support site organisation & protection during installation.

Clean the chamber before handover rather than leaving construction debris for the first rainfall to redistribute.

Recheck the Area After Paving or Resurfacing

Changing the surrounding surface can change drainage behaviour even when the pit itself hasn't moved.

After external works, inspect:

► Surface fall
► Cover height
► Ponding
► Vehicle crossing
► Access clearance
► Nearby drainage inlets

Spring Jobsite Prep Getting Your Gear Ready reinforces the value of checking working areas & equipment before changing conditions expose overlooked problems.

Treat Small Components as Part of the Whole Installation

A pit cover may be one relatively simple component, but poor selection can compromise an otherwise well-planned job.

Why Good Fasteners Matter More Than the Tool You Drive Them With explores the same practical principle: seemingly minor components can influence how reliably the finished work performs.

Specify the cover with the same discipline used for the pit, pipework & surrounding surface.

Expert Tips

► Follow the water before choosing the cover. If runoff needs to enter through the top, investigate a grate instead.
► Record the RELN series while the existing pit is accessible. Future replacement orders become considerably easier.
► Separate “vehicle accessible” from “commercial vehicle traffic”. They don't automatically require the same load classification.
► Measure the supporting seat as well as the old cover. Compatibility is more important than approximate external dimensions.
► Check for rocking before blaming the checker plate. Debris, damaged seating or surrounding movement can produce the same symptom.
► Photograph product markings before disposal. A damaged original cover can still contain the information needed to identify its replacement.
► Leave enough clearance to lift the cover later. Maintenance access shouldn't depend on removing surrounding landscaping or fixtures.
► Inspect downstream & upstream connections. A clean solid cover tells you very little about sediment already inside the drainage network.
► Plan larger-cover handling during installation. That same cover will eventually need to come off for maintenance.