Red Sea Overflow Box Cover Single Outlet
Water type
Marine
Fits
Reefer Nano, 170, 250, 350, 450, Reefer XL 425, 525, Reefer XXL 625, 750, Reefer Peninsula 650
Part no.
R42181
Genuine part
Yes, genuine Red Sea
Red Sea Overflow Box Cover Single Outlet
Genuine Red Sea overflow box cover – single outlet. This factory cover neatens the overflow weir on single-outlet Red Sea REEFER systems, keeping fish, snails and larger debris out of the downpipe. It's a direct-fit replacement, not a universal part – check your model against the fits-list below before ordering.
Key features
- Genuine Red Sea part – factory single-outlet overflow box cover, part number R42181.
- Keeps livestock and debris out of the plumbing – stops fish and snails wandering into the downpipe and blocking flow.
- Tidies the overflow's appearance – a clean factory finish over the weir instead of open plumbing.
- Direct-fit replacement – matches the original cover on eligible REEFER systems, no modification needed.
Will it fit my tank?
This cover fits the single-outlet overflow box used across most of the Red Sea REEFER range. It does not fit dual-outlet REEFER models or the MAX series, which use a different overflow box design.
Specifications
| Spec | Red Sea Overflow Box Cover – Single Outlet |
|---|---|
| SKU | RED530a |
| Manufacturer part number | R42181 |
| Fits | Red Sea REEFER single-outlet overflow box – see fits-list below |
| Outlet configuration | Single outlet |
Compatibility, spares and supersession
Reported by Red Sea REEFER parts retailers as fitting the single-outlet overflow box across these ranges. Confirm your tank's exact model before ordering, since REEFER generations (V3, V3A, G2) can share a cover even where the display size differs.
| REEFER range | Models |
|---|---|
| Nano | REEFER Nano |
| Compact | REEFER 170, 170A, 250, 250 V3, 250 V3A, 250 G2, 350, 350 V3, 350 V3A, 350 G2 |
| XL | REEFER XL 200, XL 300, XL 425, XL 425 V3, XL 425 V3A, 425 G2, XL 525, XL 525 V3, XL 525 V3A, 525 G2 |
| Peninsula | REEFER Peninsula 500, Peninsula 650, Peninsula 650 A |
| XXL | REEFER XXL 625, 625 A, 625 G2, XXL 750, 750-2 |
Does not fit: dual-outlet REEFER overflow boxes, or any MAX, MAX E, MAX S or MAX Nano system – these use a different overflow box design.
Suitable for, and not suitable for
- Suitable as a genuine replacement where the original single-outlet cover is lost, cracked or discoloured.
- Not suitable for dual-outlet REEFER overflow boxes or any MAX-series system.
Goes well with
- Red Sea Reefer Skimmer 300 – sits behind the overflow in the sump, downstream of this cover.
Warranty and delivery
Backed by Red Sea's standard product warranty, in addition to your rights under Australian Consumer Law. Ships as a standard parcel.
Common questions
How do I know if I need the single-outlet or dual-outlet cover?
Check the overflow box on your tank – a single-outlet box has one downpipe opening under the cover. If your REEFER has two downpipe openings, this is the wrong part.
Is this a genuine Red Sea part?
Yes – it's the factory replacement cover, part number R42181, not an aftermarket equivalent.
Does this fit MAX or MAX S systems?
No. This cover is designed for the REEFER range's overflow box. MAX, MAX E, MAX S and MAX Nano systems use a different overflow design and need their own parts.
