Aladdin Diffuser O-Ring For Hayward TriStar and EcoStar Pumps | SPX4000Z1 | O-83

The Aladdin O-83 is a direct aftermarket replacement for Hayward part number SPX4000Z1, serving as the diffuser O-ring — and union O-ring on select models — for the Hayward TriStar, EcoStar, and NorthStar pump series. Seated between the diffuser and pump housing, this O-ring creates the critical internal seal that maintains prime, prevents air infiltration, and keeps the pump operating at peak hydraulic efficiency. A worn or degraded diffuser O-ring is one of the most common causes of air leaks, loss of prime, and reduced pump pressure — symptoms that are frequently misdiagnosed as more serious mechanical problems. Measuring 2-3/8 inches inside diameter, 2-3/4 inches outside diameter, and 3/16 inches in cross-section, the O-83 matches OEM dimensions precisely for a leak-free, drop-in fit. Compatible with EcoStar SP3400VSP and SP3400VSPVR, TriStar SP3200EE, SP3200X, SP3200VSP, SP3250EE, SP3600, and NorthStar SP4000 and SP4000X pump models.

Highlights

• Direct Replacement for Hayward SPX4000Z1 Engineered to exact OEM dimensions — 2-3/8" inside diameter, 2-3/4" outside diameter, and 3/16" cross-section — for a precise, properly seated fit across all compatible TriStar, EcoStar, and NorthStar pump models.
• Seals the Diffuser for Efficient Pump Operation Creates the internal pressure seal between the diffuser and pump housing that maintains prime and hydraulic efficiency. A degraded seal is one of the leading causes of air entrainment, pressure loss, and loss of prime.
• Also Serves as Union O-Ring on Select Models On NorthStar and pre-2007 TriStar models, the SPX4000Z1 also functions as the union O-ring — the Aladdin O-83 covers both applications across the full compatible Hayward pump range.
• Broad Hayward Pump Compatibility Confirmed fitment across EcoStar SP3400VSP and SP3400VSPVR, TriStar SP3200EE, SP3200X, SP3200VSP, SP3250EE, and SP3600, and NorthStar SP4000 and SP4000X series.
• Pool-Grade Chemical-Resistant Construction Molded from durable pool-grade rubber resistant to pool chemicals, acids, alkalis, and salt solutions — maintaining elasticity and sealing performance throughout extended pool season use.

Includes

• (1) Aladdin O-83 O-Ring

Compatibility

• Hayward TriStar Pumps
• Hayward TriStar VS 900 Pumps
• Hayward TriStar VS 950 Pumps
• Hayward EcoStar Pumps

Note: This o-ring may be compatible with your pump, please refer to your systems owners manual to ensure compatibility.

Diagram