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 the union O-ring on select models — for the Hayward TriStar, EcoStar, and NorthStar pump series. Seated between the diffuser and the 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, and these symptoms are frequently misdiagnosed as more serious mechanical problems before the seal is checked. The O-83 measures 2-3/8 inches inside diameter, 2-3/4 inches outside diameter, and 3/16 inches in cross-section, matching OEM dimensions precisely for a leak-free, drop-in fit. The O-83 is compatible with EcoStar SP3400VSP and SP3400VSPVR, TriStar SP3200EE, SP3200X, SP3200VSP, SP3250EE, SP3600, and NorthStar SP4000 and SP4000X pump models.

Highlights

• Direct Hayward SPX4000Z1 Replacement: Aladdin engineers the O-83 to exact OEM dimensions — 2-3/8 inch inside diameter, 2-3/4 inch outside diameter, and 3/16 inch cross-section — ensuring a precise, properly seated fit across all compatible Hayward TriStar, EcoStar, and NorthStar pool pump models during routine seal replacement or pump rebuild work.
• Seals the Diffuser for Efficient Hydraulics: The diffuser O-ring forms the internal pressure seal between the diffuser and the pump housing that holds prime and maintains hydraulic efficiency, and a degraded version of this seal is one of the leading causes of air entrainment, pressure loss, and loss of prime issues in Hayward premium pump installations.
• Also Functions as Union O-Ring on Select Models: On NorthStar pumps and pre-2007 TriStar models, the SPX4000Z1 also serves as the union O-ring, and the Aladdin O-83 covers both applications, providing a versatile single-part replacement across the broader range of compatible Hayward high-performance pump installations.
• Wide Hayward Pump Coverage: Confirmed fitment across Hayward EcoStar SP3400VSP and SP3400VSPVR, TriStar SP3200EE, SP3200X, SP3200VSP, SP3250EE, and SP3600, and NorthStar SP4000 and SP4000X pump models, the O-83 supports a broad slice of Hayward's most widely installed premium residential pool pump lineup.
• Chemical-Resistant Pool-Grade Rubber: Molded from durable pool-grade rubber that resists pool chemicals, acids, alkalis, and salt chlorine generator solutions, the O-83 holds its elasticity and sealing performance throughout extended pool season use without hardening, cracking, or compressing out of shape under continuous service pressure.