Nelsen Lateral, 18", 21" and 24" Tanks

A replacement distributor lateral sized for 18", 21", and 24" tanks. Laterals form the lower distributor hub inside larger filter and softener tanks, spreading service and backwash flow evenly across the media bed while keeping the bed from washing into the plumbing. This part fits the common mid-size commercial tank diameters.

• Fits 18", 21", and 24" diameter mineral tanks
• Functions as the lower distributor / lateral hub within the tank
• Slotted design retains media while passing treated water
• Molded plastic construction resistant to corrosion
• Lightweight service part at roughly 0.3 lb
• Nelsen Corp component for tank rebuilds and repairs

Use this lateral when rebuilding a larger tank or replacing a cracked or clogged distributor. Match the lateral hub thread to your existing riser tube and confirm your tank falls in the 18-to-24-inch range. It is an internal component, so the tank must be opened and media removed to install.

Nelsen Lateral for 18, 21, and 24-Inch Tanks

This Nelsen lateral is an internal distributor component intended for larger mineral tanks, specifically the 18, 21, and 24-inch diameter sizes noted in the title. Laterals are the arms that branch out near the bottom of a tank to collect and distribute water evenly across the media bed, which is essential for both proper treatment and effective backwashing in wider tanks.

The Role of a Lateral System

In smaller tanks a single distributor basket often does the job, but as tank diameter grows, water needs to be gathered and spread across a much larger area. A lateral system, with multiple arms radiating from a central hub, ensures water flows through the entire media bed rather than channeling down one path. Even distribution like this is what keeps filtration and softening working uniformly and helps backwash lift and rinse the whole bed during regeneration.

When It Is Needed

You will reach for a lateral when building a new large-diameter tank, rebedding an existing one, or replacing an arm that has cracked or clogged. A damaged lateral can let media escape into the plumbing or create dead spots in the bed, so keeping the distribution system intact is important to overall performance and to protecting your control valve downstream. Matching the lateral to your specific tank diameter is key, since a part meant for a different size will not seat or distribute the way it should.

If you are unsure which configuration suits your tank, Water Softener Plus is glad to help you confirm the right lateral for your build, and we include the reference details you need to assemble your distribution system correctly.