How do i get a 20mm replacement nozzle for this pump ?

I have been trying to reach this seller for quite some time now without any success. I have used the email address on the box as well as tried messaging them here.... no luck

How do i set this product to be on a steady flow. The manual isn't clear.

If you press the mode button it switches between 3 digit numbers starting with a 1 or a 2. anything starting with 1 is steady flow. If you decide to use wave mode though the number preceded by 1 also affects wave mode. The number preceded by 1 appears to affect duration of the pulse where as the number preceded by 2 affects the time between pulses if the fist number is set to high the pump runs continuously regardless because the cycle doesn't end before the second begins. So long story short if I set the first setting to 101-104 then set the second number to 209-210 my tank really rocks and roles. Timing and duration are key to getting a wave going.

Can I use this pump externally?

Yes and No. Mine leaked external. I had to silicone it by unscrewing it and sealing it completely with silicone. Now it doesn't leak and is external. Caveat Emptor. But, so far a great pump.

yes, i have 2 of the 18000 models and they are both submerged ...

Deliver to Bolivia

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Orlushy DC-4000 Silent Swirl Controllable DC aquarium Pump 25W 1050GPH-marine wavemaker return pump with sine wave Controller for salt/Freshwater coral reef fish tank sump Circulation

Orlushy DC-4000 Silent Swirl Controllable DC aquarium Pump 25W 1050GPH-marine wavemaker return pump with sine wave Controller for salt/Freshwater coral reef fish tank sump Circulation

Product ID: 68543846

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Details

Brand
Orlushy
Color
Black
Material
Copper
Style
Submersible
Product Dimensions
2.64"L x 1.3"W
Power Source
dc

⚡Energy-saving 25W brushless motor

🔇Ultra-quiet sine wave tech

🎛️20 speeds + 3 modes control

Description

🌊 Silence meets power — elevate your aquarium’s flow game!

POWERFUL EFFICIENT - Robust 25W pure copper brushless motor delivers up to 1050 GPH (17.6 GPM) flow with low 24V voltage for safety and energy savings.
PEACE OF MIND WARRANTY - 180-day warranty with free replacement parts and responsive customer support ensures your investment stays protected.
WHISPER QUIET OPERATION - Sine wave frequency tech and ceramic shaft ensure near-silent pump performance—perfect for serene home or office aquariums.
VERSATILE NOZZLE OPTIONS - Includes 3 nozzle sizes for seamless adaptation across marine, freshwater, hydroponic, and decorative water features.
CUSTOMIZABLE FLOW CONTROL - Easily switch between 20 speed settings and 3 modes (Constant, Wave, Feed) via external controller to tailor water movement to your tank’s needs.

The Orlushy DC-4000 is a 25W submersible aquarium pump featuring ultra-quiet sine wave technology, a durable brushless copper motor, and 20 adjustable speeds with 3 operational modes. Designed for both saltwater and freshwater tanks, it delivers up to 1050 GPH flow at a safe 24V, includes multiple nozzles for versatile use, and comes backed by a 180-day warranty for reliable performance.

Specifications

Brand	Orlushy
Color	Black
Material	Copper
Style	Submersible
Product Dimensions	2.64"L x 1.3"W x 1.58"H
Power Source	dc
Item Weight	4 Pounds
Maximum Flow Rate	17.6 Gallons Per Minute
Maximum Lifting Height	11.5 Feet
Voltage	24 Volts
Manufacturer	aquariumstation
UPC	634759664451
Part Number	43237-2
Item Weight	3.97 pounds
Item model number	43237-2
Is Discontinued By Manufacturer	No
Size	DC4000
Wattage	25 watts
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No