Kasco Marine Robust Aire System 4- 120 Volt


4 Diffuser Assembly with 400′ of 3/8″ SureSink Tubing – 120 Volt



The Robust-Aire RA4 system includes 2 dual port rocking piston compressor, 2 valved aluminum manifolds, 400 feet of 3/8 inch Sure Sink weighted tubing, and four (4) Robust Aire diffuser assembly.

Robust-Aire Diffusers

Robust-Aire diffusers are the most efficient on the market and create more water flow to aerate your pond. Diffusers are designed to provide a fine air bubble with the least amount of pressure. The base is made of durable plastic and a locking fill plug allows you to fill it with gravel or other weighted substrate. It has a raised design that keeps the diffusers performing at an optimal level above the pond bottom. A durable, bolted, strain relief attachment insures that the weighted tubing will not become detached during installation or maintenance. A check valve with Viton seals keeps water from entering the tubing when the system is not operating.

Enclosures: Each of the systems is available with twp options for enclosures:

Option #1 – No Cabinet (NC): This is desired when you want to install the compressor system in your own structure. Compressors need to be kept out of the weather in a ventilated area. Remote manifold is easily mounted via wood screws.

Option #2- A large base mount cabinet is included as the default method for the system.

Dimensions are 22″ x 17″ x 19″H and includes

120 volt receptacle or a 240 volt junction box.

A single cooling fan provides 110 CFM ventilation.

Compressor is mounted in the keyed, lockable cabinet.

Robust-Aire System

Pond Size*
(surface acres)



# Diffuser assemblies






CFM at 10 psi



SureSink Weighted 3/8 tubing



Maximum Depth












10.9 /6






400 feet



40 feet


















500 feet



40 feet


















600 feet



40 feet



Sure Sink weighted tubing is available in easy to handle 100 foot coils. RA systems 1-3 include 100 feet of 3/8 tubing for each diffuser. Each coil is boxed and includes our full packet of barbed connectors and adapter fittings, and all-stainless steel tubing clamps. You will be prepared to make any connection necessary with the tubing kit. Additional 3/8″ or 5/8″ SureSink weighted tubing is available when additional length is needed.

Robust-Aire rocking piston compressors

provide efficient, continuous-duty operation with minimal maintenance and quiet operation. Units are extremely quiet.
Sound level is less than: 70 dB without cabinet (Window air conditioner), 65 dB with cabinet and acoustic sound proofing (Normal conversation)

Safely starts under pressure. Maximum operating depth 40 feet.

Warranty: One year complete warranty on all parts.

Additional information


No Cabinet, Post Mount Cabinet, Large Cabinet


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