Nelsen Retention Tank Head

The Nelsen Retention Tank Head is a replacement closure fitting for retention and contact tanks. This is Nelsen Corp part 1190RT, the top head component that seals the vessel and provides the plumbing connection point on a retention tank used in oxidation and chemical-contact water treatment.

• Manufacturer: Nelsen Corp
• Part number: 1190RT (alternate reference D1400RT)
• Component type: retention / contact tank head
• Role: seals the tank opening and forms the inlet/outlet connection
• Application: air-charge, chlorine, or ozone contact vessels
• Compact service part, light shipping weight of about half a pound

Retention tanks give oxidized iron, sulfur, or an injected chemical enough dwell time to fully react before the water reaches a downstream filter or the rest of the plumbing. The tank head is the sealing point that ties the vessel into that loop, so a cracked, worn, or leaking head is a common failure point worth replacing directly rather than swapping the entire tank. Because retention systems run under line pressure, a compromised head can weep or drip and should be addressed promptly. Confirm this head matches your existing retention tank's threading, diameter, and port configuration before installing. Keep one on hand as a maintenance spare for well-water treatment trains built around a contact or aeration tank.

Nelsen Retention Tank Head

This Nelsen retention tank head is the top fitting for a contact or retention tank, the vessel that gives treated water the dwell time it needs before it continues on to the home. The head seals the top of the tank and provides the inlet and outlet connections that route water in and back out, making it a key structural and plumbing component of the assembly.

What a Retention Tank Does

Retention tanks are common in systems that inject a treatment chemical, such as chlorine for disinfection or a solution for oxidizing iron and sulfur. The tank holds the water long enough for the treatment to finish reacting before that water reaches your fixtures. Without adequate contact time, the treatment may not fully complete its job, which is why the tank and its sealing head are important parts of the overall design.

Service and Replacement

The tank head is what you access when connecting the tank into your plumbing or servicing the vessel. Over years of use, a head can be damaged, cracked, or worn at its seals and connection points, at which point replacing it restores a proper seal and reliable flow. Matching the head to your tank's threading and port configuration is essential for a leak-free result, so it pays to check your existing fitting before ordering a replacement.

If you are unsure whether this head matches your retention tank, Water Softener Plus is happy to help you confirm fitment before you order. We include the documentation you need to install it correctly and get your system sealed and flowing the way it should.