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.