Pentair 20.5" Brass Vertical Tie Rod

The Pentair 20.5" Sta-Rite Brass Vertical Tie Rod (Part #23900-0039 / #23900-0039Z) is a precision-machined structural fastener engineered exclusively for Pentair Sta-Rite Diatomaceous Earth (D.E.) pool and spa filtration lines, most notably the System 3 SD Series (such as models S7D75 and S8D110) as well as the DEP and DES series.

Fabricated from high-tensile, marine-grade brass alloy, this 20.5-inch rod provides exceptional resistance to oxidation, scaling, and chemical degradation inside the intensely chlorinated, wet environment of a pressurized filter vessel. Positioned vertically through the core of the internal filter element assembly, the tie rod works in tandem with wing nuts or hex hardware to lock the heavy plastic grid plates and individual D.E. grid segments into an immutable, parallel matrix. This structural compression ensures that the delicate internal grid fabric maintains perfect geometric alignment and uniform spacing, preventing the elements from shifting, twisting, or collapsing under heavy hydraulic pump cycles or high-velocity backwash loads.

Weight Profile

As a solid brass rod, its physical weight profile is highly concentrated yet slim:

• Actual Product Weight: Approximately 0.55 to 0.65 pounds (roughly 8.8 to 10.4 ounces).

• Packaged Shipping Weight: Typically scales at 1.0 to 1.5 pounds due to the long, rigid cardboard mailing tubes or protective rectangular boxes required to prevent the dense brass threads from bending or flattening during transport.