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

Engineered as a direct aftermarket replacement for Hayward part number SPX4000Z1, the Aladdin O-83 functions as the diffuser O-ring — and on select models as the union O-ring — across the Hayward TriStar, EcoStar, and NorthStar pump series. The O-ring seats between the diffuser and the pump housing and forms the critical internal seal that holds prime, blocks air infiltration, and keeps the pump running at peak hydraulic efficiency over its service life. Because a worn or degraded diffuser O-ring is one of the most common causes of air leaks, loss of prime, and reduced pump pressure, this seal often gets overlooked during troubleshooting, with the symptoms misdiagnosed as larger mechanical problems before the O-ring is even inspected. 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 during service work. Confirmed compatibility includes EcoStar SP3400VSP and SP3400VSPVR, TriStar SP3200EE, SP3200X, SP3200VSP, SP3250EE, SP3600, and NorthStar SP4000 and SP4000X pump models.

• Precise SPX4000Z1 Dimensional Match: The O-83 is engineered to match the OEM Hayward SPX4000Z1 dimensions exactly — 2-3/8 inch inside diameter, 2-3/4 inch outside diameter, and 3/16 inch cross-section — so the seal seats correctly in the diffuser groove and forms a leak-free interface during reassembly across compatible Hayward TriStar, EcoStar, and NorthStar pump platforms.
• Holds Prime and Hydraulic Pressure: As the diffuser O-ring, the seal maintains the internal pressure boundary between the diffuser and pump housing, which is essential to keeping the pump primed and operating at the efficiency the motor and impeller were designed for, and replacing a worn version of this seal often resolves persistent air leaks and prime loss complaints.
• Doubles as Union O-Ring on Some Models: On NorthStar pumps and pre-2007 TriStar models, the SPX4000Z1 is also used as the pump union O-ring, and because the Aladdin O-83 carries the same dimensions, it serves both functions, simplifying parts stocking for service technicians who work on multiple Hayward pump generations across their accounts.
• Pump Model Compatibility List: The O-83 is confirmed compatible with Hayward EcoStar SP3400VSP and SP3400VSPVR, TriStar SP3200EE, SP3200X, SP3200VSP, SP3250EE, and SP3600, and NorthStar SP4000 and SP4000X pump models, covering a wide cross-section of Hayward's most commonly encountered premium residential pool pumps in the field.
• Built to Survive Pool Pump Conditions: Molded from pool-grade rubber chosen specifically for chemical resistance against chlorine, balancing chemicals, acids, alkalis, and salt cell brine, the O-83 maintains its elasticity and proper sealing geometry through extended pool season service without hardening, cracking, or taking a permanent set inside the pump.

• (1) Aladdin O-83 O-Ring