Aqua Terra Backyard
Pentair 194989Z Brass Nut
Pentair 194989Z Brass Nut
Pentair 194989Z Brass Nut Replacement
The Pentair 194989Z Brass Nut is a replacement clamp nut used on select older Pentair, Purex, and PacFab stainless steel D.E. filter clamp assemblies. This machined brass nut is part of the filter clamp tightening hardware and works with the matching clamp spring and T-bolt to help secure the filter clamp band around the tank.
If your original brass clamp nut is stripped, rounded, seized, corroded, or no longer threading smoothly onto the T-bolt, replacing it with the correct 194989Z nut can help restore proper clamp operation without replacing the entire clamp band.
Why Buy the Pentair 194989Z Brass Nut?
- Replacement brass clamp nut for compatible Pentair/Purex stainless D.E. filter clamp hardware
- Helps repair worn tightening hardware when the original nut is stripped, damaged, or difficult to turn
- Commonly used on legacy Nautilus / NS-style clamp setups
- Pairs with the correct T-bolt and spring hardware to refresh the clamp tightening points
- Practical repair part for older filters where complete clamp assemblies may no longer be available
Product Details
| Brand | Pentair |
| Manufacturer Part Number | 194989Z |
| Product Type | Filter Clamp Brass Nut / Machined Clamp Nut |
| Material | Brass |
| Application | Compatible older Pentair, Purex, PacFab, and Nautilus-style stainless D.E. filter clamp assemblies |
What Does the 194989Z Brass Nut Do?
The brass clamp nut threads onto the filter clamp T-bolt and works with the spring and washer hardware to tighten the clamp band. As the nut is tightened, it compresses the spring and helps pull the clamp ends together so the filter tank can be secured properly.
Over time, the original nut can become worn, stripped, seized, or difficult to turn. When that happens, the clamp may be harder to open and close, or it may not tighten evenly. Replacing the brass nut is a common repair when the clamp band itself is still usable but the tightening hardware is worn.
ATB Fitment Note
The 194989Z brass nut should be matched with the correct T-bolt and spring hardware for your specific clamp assembly. If your T-bolt threads are damaged or your springs are worn, replace those parts at the same time so the clamp tightens smoothly and evenly.
When Should This Brass Nut Be Replaced?
- The clamp nut is stripped or cross-threaded
- The nut is rounded off or difficult to grip
- The nut no longer threads smoothly onto the T-bolt
- The clamp is difficult to tighten or loosen during filter service
- You are refreshing the clamp hardware on an older stainless D.E. filter
Common Repair Pairing
On compatible legacy stainless D.E. filter clamp setups, the Pentair 194989Z Brass Nut is commonly replaced along with the matching clamp spring and stainless T-bolt. If both sides of the clamp hardware are worn, you may need two brass nuts, two springs, and two T-bolts to refresh both tightening points.
Important: This listing is for the brass nut only. It does not include the T-bolt, spring, washers, clamp band, or complete clamp assembly unless those parts are purchased separately.
Frequently Asked Questions
What is the Pentair 194989Z used for?
The Pentair 194989Z is a replacement brass clamp nut used on compatible older Pentair, Purex, PacFab, and Nautilus-style stainless D.E. filter clamp assemblies.
Does this include the T-bolt or spring?
No. This listing is for the brass nut only. The T-bolt, spring, washers, and clamp band are separate parts.
What does the brass nut screw onto?
The brass nut threads onto the clamp T-bolt. It does not screw into the filter tank itself. It is part of the clamp tightening hardware that helps pull the clamp band closed.
Should I replace both brass nuts?
If both sides of the clamp hardware are worn, difficult to tighten, or corroded, replacing both brass nuts is recommended so the clamp tightens evenly.
Can I use a hardware store nut instead?
No. Filter clamp hardware is used on a pressurized filter tank and should be replaced with the correct compatible clamp hardware. Generic hardware should not be used as a substitute.
Order Pentair 194989Z from Aqua Terra Backyard
At Aqua Terra Backyard, we help pool owners and service professionals keep older pool equipment serviceable with the right replacement parts. The Pentair 194989Z Brass Nut is a key repair part for compatible stainless D.E. filter clamp assemblies when the original clamp nut is stripped, worn, or difficult to tighten.
Need the matching hardware? If your T-bolt or spring is also damaged, pair this brass nut with the correct compatible T-bolt and clamp spring to complete the repair safely.
