Pentair
Pentair Union, Bulkhead Before 1-1-90 (Set of 2)
Best replacement seal for vintage pool filtration systems.
Ensure your pool or spa filtration system operates smoothly with this essential set of two Pentair Union Bulkhead connectors. Specifically designed for equipment manufactured before January 1, 1990, these unions provide a reliable seal for your filter system. As a crucial accessory, they guarantee proper connection and prevent leaks, maintaining optimal performance. The part number for this set is 50901100. Please note, this product includes a California Proposition 65 warning concerning cancer and reproductive harm.
$79.99
Owner Satisfaction
4.5
/ 5
Category Rank
446
/ 2958
#446 in Pool & Spa Accessories
Price vs Category Average
-76%
Below average
Manufacturer
Pentair
/ Pentair
Who it's for
- Owners maintaining vintage pool equipment systems
- Pool technicians prioritizing reliable OEM parts
- DIY homeowners needing quick, tool-free component servicing
Who should skip it
- Budget-conscious buyers seeking standard plumbing components
- Owners of modern pool equipment installations
- Users concerned about long-term plastic durability
Performance breakdown
Legacy Compatibility
Precision engineering specifically tailored for vintage pre-1990 filtration systems.
Seal Integrity
Provides a robust, leak-proof connection essential for high-pressure pool environments.
Installation Simplicity
Straightforward bulkhead design allows for quick replacement on older equipment.
Material Durability
Resilient construction withstands the harsh chemical exposure common in pool maintenance.
Value Proposition
Bundled set of two offers a cost-effective solution for system restoration.
Part Availability
Hard-to-find component that keeps aging filtration hardware running reliably.
Key Specs
Manufacturer
Pentair
Part Number
50901100
Included Items
Set of 2 Unions
Installation Type
Residential
Product Type
Pool Part
Application
Pool Filter Accessory
Filter Type
Cartridge
Application Type
Spa
Features
- Includes a complete set of two unions
- Bulkhead style connection
- Designed for pre-1990 equipment
- Ensures proper system sealing
- Essential pool filter accessory
What customers say
Owners of legacy pool systems highly value this exact OEM replacement bulkhead set. The primary theme is relief and satisfaction derived from finding a precise fit for equipment manufactured before 1990. Reviewers consistently praise the high quality and perfect specifications, which ensure a reliable, leak free seal. This component acts as a critical lifeline, effectively extending the lifespan of older infrastructure and avoiding costly system overhauls. While the price reflects its specialized nature, customers accept the cost for guaranteed compatibility. The product earns high marks for solving a difficult maintenance problem efficiently, reflecting deep appreciation for its availability and reliability in this niche market.
Know before you buy
These unions are specifically engineered for Pentair filtration equipment manufactured before January 1, 1990. Please verify your system's production date or check your existing part numbers against the 50901100 specification before purchasing.
Yes, this package includes a complete set of two bulkhead unions. It is designed to provide a direct replacement for your existing connections to ensure a leak-free seal.
No, these are specifically designed for older, pre-1990 equipment. Using them on newer systems may result in improper fitment or leaks, as connection standards have evolved since that time.
The warning indicates that the product contains chemicals known to the State of California to cause cancer or reproductive harm. It is a standard regulatory disclosure for many pool components and does not impact the functionality of the part.
Yes, these unions are designed for use in both pool and spa filtration setups. They are specifically intended for cartridge-style filter systems.
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Ask Hayley anything about this product before you decide.