3/4in Random Flow Generator® Flow Kit – 3/4 Flex-Series RFG

Works With


Recommended for Gen 2 dual outlet (on either side of the overflow) models for the Red Sea Reefer 525 and above

Waterbox Aquariums

Waterbox aquarium with DN20 stock return nozzles (check your aquariums specs here)

Plus, many other aquariums using the included Adapter – scroll down for full list

Kit Includes:

  • The Patented Random Flow Generator® Nozzle
    3/4in Flex-Series Random Flow Generator® Nozzles – RFG075-FLX
  • New Flex-Series Adapters
    – 2530-075 Multidapter™
    – MHA2830LL075 Modular hose converter
    – 3035-075 Multidapter™
  • Genuine Loc-line
    Genuine 3/4in Loc-Line® fittings

Includes the New Flex Series Random Flow Generator®

RFG-FLXExtremely Durable and Flexible Material
Manufactured with a reef-safe TPU (Thermoplastic Polyurethane)


9 in stock (can be backordered)

SKU: RFGFK075X1 Category: Tag:

RFGFK075X1 flow kit CompatibilityBroad Compatibility

The 3/4in Random Flow Generator® Return Line Upgrade Kit is highly versatility and is directly compatible with wide variety of aquarium brands and models, including the aquariums listed below

  • Red Sea Reefer G2  - Recommended for 525 and above (All Models - one kit per outlet)
  • Red Sea MAX (Return Line)
  • Tideline All-In-One - 20 gallons and larger
  • CADE Classic and Reef 900 Series (recommended for Reef 900 and larger)
  • Waterbox DN20 modular hose return lines
  • Innovative Marine NXT and EXT Systems
  • Most Custom Build Aquariums
  • 3/4in Loc-Line® brand modular hose
  • 3/4in bulkheads, Schl40 elbow and socket fittings
  • 1in bulkheads, Schl40 elbow and socket fittings
  • 20mm and 25mm Pipe
  • Any bulkhead or pipe socket fitting with a 25mm to 30mm inner diameter
  • Any bulkhead or pipe socket fitting with a 30mm to 35mm inner diameter
  • and more!



Includes a Adapters!

This kit includes the 2530-075 and 3035-075 Sereis Multidapter™ fittings making this kit highly versatile flow kit that fits many different aquarium brands and plumbing designs. it also includes a 2830-075 Sereis modular hose adapter. This fitting is compatible with modular hose with a 28mm to 30mm ball connector out diameter. This includes the popular Waterbox DN20 return lines.













Includes the Flex-Series Random Flow Generator ® Nozzle


RFG Flex Series Nozzle will fit genuine Loc-Line® brand modular hose but also adapt to fit other similar sized modular hose fittings.

The RFG Flex Series is directly compatible with a wider range of aquariums and modular hose designs.


Made with a strong, extremely durable and flexible material, the RFG Flex Series won’t crack, it can’t break and has superior durability.
It’s also extremely easy to clean, since most algae and bio films simply slide right off with minimal effort.

The Patented Random Flow-Generator® NozzleA Trusted Design

The RFG Flex Series maintains the patented design of the Random Flow Generator® Nozzle. The design continues to be trusted by aquarium hobbyists and aquatic industry users alike. The RFG Flex Series will build on this trust earned over the years by delivering a new level of durability, flexibility and an enhanced functionality.