CPI - 1-1/2" RV Tank Grommet Fitting - 2-1/4" Hole - Part 91 (500123)

CPISKU: 91
Added to catalog: January 06, 2023
Last product update: July 13, 2026 at 9:22 PM

Sale price$9.95 Regular price$15.79
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In stock at Elkhart RV Parts (646 units), ready to ship
Availability details
Elkhart RV Parts warehouse646 ready to ship
ERVP overstock warehouse0 available
This quantity is stocked at ERVP. See the delivery estimate below for the current expected window.
Delivery Estimate July 22 – July 25
1-Hour Cancellation Window

1-Hour Cancellation Window

You'll have 1 hour after placing your order to update your shipping address or cancel completely.

After that, we begin coordinating with our vendors to fulfill your order — at that point, cancellations and address changes usually aren't possible.

If you're unsure about anything, please reach out before ordering or cancel within the window.

Seal the Deal with Our 1-1/2" Flex Rubber Grommet for Your RV Tank
Easily seal and connect your RV fresh water or holding tank with this 1-1/2" slip flex rubber grommet fitting, designed for a snug fit in a 2-1/4" hole. Durable and flexible, it ensures a leak-resistant installation and is perfect for RV plumbing upgrades or repairs.
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✓ 100% Verified Authentic OEM Grade Part

CPI 1-1/2" Flex Rubber Grommet Tank Fitting - Part 91

This professional-grade 1-1/2" slip flex rubber grommet fitting is specifically engineered for RV fresh water tanks and holding tanks. Manufactured by CPI, a trusted leader in RV tank components, this grommet fitting (Part # 91 / 500123) provides a secure, leak-resistant connection for 2-1/4" hole installations.

Why Choose This CPI RV Tank Grommet Fitting?

  • Authentic CPI Quality: 100% genuine CPI part, not a generic substitute - ensures proper fit and long-lasting performance
  • Flexible Rubber Construction: Premium rubber material flexes to accommodate tank movement and vibration during travel
  • Leak-Resistant Design: Creates a watertight seal to prevent costly leaks in your RV's water system
  • Easy Installation: Slip-fit design makes installation straightforward for DIY RV owners and professional technicians
  • Versatile Application: Works with both fresh water and holding tanks for maximum utility

Technical Specifications

  • Fitting Size: 1-1/2" slip connection
  • Required Hole Size: 2-1/4" diameter
  • Material: Flexible rubber compound
  • Part Numbers: 91, 500123
  • Manufacturer: CPI
  • Application: RV fresh water tanks, RV holding tanks
  • Country of Origin: Canada

Common Applications & Compatibility

This grommet fitting is ideal for:

  • RV fresh water tank installations and repairs
  • RV black water holding tank connections
  • RV grey water holding tank fittings
  • Camper and motorhome water system upgrades
  • Travel trailer tank replacements
  • Fifth wheel plumbing repairs

Installation & Use

The 1-1/2" flex rubber grommet fitting installs into a 2-1/4" hole drilled in your RV tank. The flexible rubber design compresses to create a secure, leak-proof seal while allowing for slight tank flexing during travel. Perfect for connecting drain lines, fill lines, or vent lines to your RV's water or waste tanks.

⚠️ Professional Installation Recommended

While this is a DIY-friendly part, proper installation is critical for preventing leaks. If you're unsure about installation, consult with an RV technician.

Why Buy From Elkhart RV Parts?

  • ✓ Authorized CPI dealer - guaranteed authentic parts
  • ✓ Fast shipping from our Indiana warehouse
  • ✓ Expert RV parts knowledge and support
  • ✓ Competitive pricing on genuine OEM components
  • ✓ Same-day shipping on in-stock orders

Need help identifying the right fitting? Use our AI Live Chat for instant product assistance and compatibility verification.

Order your authentic CPI 1-1/2" RV tank grommet fitting today and ensure a leak-free water system in your RV!

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100% Authentic OEM Parts

Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.

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