600mm Filter/Shaft Seal | 381516

Specifically for use with the Graf External Filter Packages for rainwater harvesting with the Carat S Tank System.

In rainwater harvesting systems, every component plays a critical role in maintaining the system’s efficiency, safety, and long-term performance. One often-overlooked but essential element is the filter or shaft seal—a simple yet indispensable piece that ensures a watertight, secure connection between filtration units and storage tanks.

The 600mm Filter/Shaft Seal (Part #381516) is designed specifically for use with Graf External Filter Packages and Carat S Underground Tanks. Whether you’re setting up a new rainwater collection system or maintaining an existing one, this seal is key to keeping water clean, uncontaminated, and flowing efficiently through your setup.

Product Overview

What It Is

This product is a 600mm diameter rubberized seal engineered to provide a tight, leak-proof connection between external filters and the neck of an underground tank. It’s typically installed at the entry point where a Graf filter shaft or filtration component joins with the Carat S tank.

What It Does

Its main job? Prevent leaks and ensure unfiltered water doesn’t bypass the filter system. It maintains proper system integrity by:

• Forming a watertight seal around the filter shaft
• Preventing debris, insects, and contaminants from entering the tank
• Supporting long-term durability under ground pressure and shifting soil

Key Features

• Made for Graf Carat S Tanks
  Precisely molded to match the specifications of the tank system.
• Flexible & Durable Rubber Composition
  Resists cracking, UV degradation, and damage over time.
• Watertight Performance
  Keeps unfiltered runoff out, making sure your tank only stores clean water.
• Quick Installation
  Push-fit design allows fast, secure installation—no adhesives or tools needed.
• Lightweight (Approx. 0.5 lbs)
  Easy to handle even for a single technician.
• Dimensions
  ~21” in diameter (to match 600mm shaft systems), with tight tolerance sealing edge.

Use Cases

Residential Rainwater Harvesting

Homeowners looking to reduce water bills or make eco-friendly choices rely on well-sealed systems. This shaft seal is perfect for:

• Backyard irrigation systems
• Greywater toilet systems
• Landscaping water storage

Commercial or Agricultural Sites

Larger systems also need reliable components to scale effectively. This seal supports:

• Greenhouses and farms collecting roof runoff
• Commercial buildings with LEED-certified rainwater reuse
• Stormwater retention systems in parking lots

Municipal or Institutional Applications

Schools, parks, and municipalities using rainwater systems also benefit from a tight-seal solution to meet code requirements and improve operational reliability.