Waterway Pump Union 1.5″ Slip x 2″ Spigot – Jacuzzi® J & K Pump Replacement (400-2160 / 2000-170)

Waterway Pump Union for Jacuzzi® J & K Pumps – 400-2160

This Waterway pump union (400-2160) is a direct replacement for older Jacuzzi® J and K style pumps, providing a secure, leak-free connection between your pump and plumbing.

Designed as a self-aligning union, this fitting makes installation easier and helps ensure a proper seal every time. Includes O-ring and lock ring, so you have everything needed for installation.

Important Fitment Notice

• Designed for Jacuzzi® J and K style pumps only
• This is a half union assembly (pump side connection)
• Always verify plumbing size before ordering (1.5″ vs 2″)
• Not compatible with all pump brands or newer Jacuzzi® models

Specifications

• Manufacturer: Waterway
• MPN: 400-2160
• Jacuzzi Part Numbers: 2000-170, 400-2160
• Connection Type:
  • Pump Side: Female Buttress Thread (FBT)
  • Plumbing Side: 1.5″ Slip x 2″ Spigot
• Union Type: Self-aligning swivel union
• Includes:
  • Union nut
  • O-ring
  • Lock ring

Compatibility

• Older Jacuzzi® J-Series pumps
• Older Jacuzzi® K-Series pumps
• Also used as a generic replacement for 31-1586-03R

Alternative / Cross Reference Part Numbers

• 2000-170
• 400-2160
• 31-1586-03R

Stop Leaks Before They Start

• Replaces worn or cracked unions that cause slow leaks
• Ensures proper alignment to prevent cross-threading
• Includes new O-ring to eliminate reusing flattened seals

Installation Tip

When replacing a pump union, always:

• Clean mating surfaces
• Lightly lubricate the O-ring with silicone grease
• Hand-tighten first, then snug — do not overtighten