I'm setting this up & I have the two connectors that you push together. However one does not seem to go in fully, but the other does. Is this normal?

There were instructions with mine. I am not sure whn you say connectors what you mean. The steriliser has a right angled spout which just pushes on. There are 3 little plugs. Two are the same and fit into two of the same corresponding sockets, the other plug is different and goes into its own socket which is different from the other two so can't be confused....

Can anyone give me the dimensions of this? Working out if it will fit in my custom interal sump.

Just measured mine, which is the 9wat model, it's 25.5cm tall, which I assume it your main requirement. It could be mounted horizontal or vertically no issue. Depth is about 8cm, width 7cm. Hope this helps.

Where can I buy spare blue sponges?

Just buy a bigger sponge/filter (Fluval filter?) and cut it into smaller pieces that match the one you have.

can i use this as well as fluval u3 filter in my marine tank .

Yes, that's what I do. The fluval filters out the excess dirt and the steriliser prevents algae bloom and keeps water clear.

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Fish 'R' Fun Green Killing Machine Internal UV Sterilizer with Power Head, 9W Upto 200 Litre

Product ID: 48418608

Details

Brand
FISH R FUN
Material
Sponge
Tank volume
2E+2 Litres
Special feature
Zig-zag Flow
Shape
Rectangular
Specific uses for product
Aquarium for

🌊200 L/h Pump Flow

💡9W UV Power

🔄Zig-zag Sterilization

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Rp3760840

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Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Keep your aquarium pristine and your fish thriving with the Green Killing Machine!

ZIG ZAG FLOW DESIGN - Maximizes sterilization time for superior water purity.
HIGH FLOW 200 L H PUMP - Ensures efficient water circulation and filtration.
POWERFUL 9 W UV STERILIZER - Kills harmful bacteria and algae for crystal-clear water.
SUBMERSIBLE FULLY SEALED - Safe, low-voltage 12V operation for worry-free underwater use.
VERSATILE AQUARIUM COMPATIBILITY - Perfect for freshwater, tropical, and marine tanks up to 200L.

The Fish 'R' Fun Green Killing Machine is a 9W internal UV sterilizer combined with a 200 L/h power head pump, designed for aquariums up to 200 litres. Featuring a unique zig-zag flow design, it maximizes sterilization time to eliminate harmful microorganisms. Fully submersible and sealed with safe 12V operation, it suits freshwater, tropical, and marine tanks, ensuring crystal-clear, healthy aquatic environments.

Specifications

Product Dimensions	18.21 x 7.59 x 23.01 cm; 820 g
Item model number	FRF-UV9W
Colour	Original
Size	Green Killing Machine 9w UV Sterilizer &Power Head
Number of Items	1
Quantity	1
Special features	Zig-zag Flow Design for Maximum Sterilisation Time
Specific Uses	Aquarium for Fish
Batteries required	No
Batteries Included	No
Item Weight	820 g

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