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When your RV plastic holding tank develops a hole, the CPI 69LB Black Spinweld Patch delivers a fast, reliable, OEM-grade repair. Engineered specifically for RV fresh water and holding tank applications, this 4-1/2" patch covers a 3-3/4" hole with a precision spinweld fit — no guesswork, no leaks.
Features & Specifications
- Part Number: 69LB (CPI / Elkhart Plastics)
- Pilot Diameter: 3.75" (3-3/4")
- Outer Diameter: 4.50" (4-1/2")
- Hole Size Covered: 3-3/4"
- Color: Black
- Material: OEM-grade plastic — compatible with standard RV holding tank materials
- Installation: Spinweld method for a secure, watertight seal
- Application: RV fresh water tanks, black water holding tanks, gray water tanks
Why Choose the CPI 69LB Spinweld Patch?
Not all RV holding tank patch fittings are created equal. The CPI 69LB is a factory-spec part sourced directly from CPI (Elkhart Plastics) — the same manufacturer that supplies original equipment to major RV builders. When you need an RV holding tank patch fitting that installs correctly the first time, this is the part professionals reach for.
The spinweld installation method creates a permanent, vibration-resistant bond that outlasts adhesive patches. Whether you're a DIY RV owner or a certified technician, the 3.75" pilot x 4.50" OD dimensions make alignment simple and the repair airtight.
Compare RV Holding Tank Patch Fittings
Not sure which patch size fits your tank hole? Use this comparison to find the right CPI spinweld patch for your application.
| Model (Part #) | Pilot Diameter | Outer Diameter | Hole Size | Best For | View Details |
|---|---|---|---|---|---|
| CPI 69LB | 3.75" | 4.50" | 3-3/4" | Large hole repair on holding tanks | Current Product |
| CPI 71B | 2.200" | 3.400" | ~2" | Medium hole repair | View |
| CPI 51B | 1.550" | 2.300" | ~1-1/2" | Small-medium hole repair | View |
| CPI 51AB | 1.00" | 2.00" | 1" | Small hole repair | View |
| CPI 81 | 1.75" | 3.00" | 1-3/4" | Medium hole repair | View |
Tip: Measure the hole diameter in your tank before ordering. The pilot diameter should be slightly larger than the hole for a proper spinweld seal.
Technical Specifications
- Part Number: 69LB
- Pilot (Hole Size): 3.75" (3-3/4")
- Outer Diameter: 4.50" (4-1/2")
- Color: Black
- Weight: 0.7 lbs
- Installation Type: Spinweld
- Compatible Tanks: RV plastic holding tanks, fresh water tanks, gray water tanks
- Manufacturer: CPI / Elkhart Plastics
What's Included
- 1x CPI 69LB Black Spinweld Patch
- Manufacturer warranty applies
Compatible Models & Alternatives
Looking for a different size? Browse our full line of RV Tank Fittings. For smaller holes, consider the CPI 51AB (1" hole) or the CPI 81 (1-3/4" hole). For medium repairs, the CPI 71B is a popular choice.
Frequently Asked Questions
How do I install a spinweld patch on my RV holding tank?
A spinweld patch is installed using a drill and spinweld tool. The patch spins at high speed against the tank surface, generating friction heat that fuses the plastic for a permanent, watertight seal.
Is the CPI 69LB compatible with black water holding tanks?
Yes. The 69LB is designed for use on RV plastic holding tanks including black water, gray water, and fresh water tanks.
What hole size does the 69LB patch cover?
The 69LB covers a 3-3/4" (3.75") hole. The outer diameter is 4.50" for full coverage and a secure seal.
Is this an OEM part?
Yes. CPI (Elkhart Plastics) is an original equipment manufacturer supplying RV builders directly. This is the same part used in factory production.
Where can I buy the CPI 69LB spinweld patch?
ElkhartRVParts.com is an authorized CPI dealer. Ordering here ensures you receive a genuine OEM-grade part with full manufacturer backing.
Can I use this patch on a fresh water tank?
Yes. The 69LB spinweld patch is compatible with both fresh water and holding tank applications.
Why Buy from Elkhart RV Parts?
We are an authorized CPI dealer with direct access to the full Elkhart Plastics catalog. Every part we sell is 100% authentic — no gray market, no counterfeits. We ship fast, stand behind every order, and our AI Live Chat is available to help you confirm fitment before you buy.
| Color | Black |
|---|---|
| Outer diameter (inches) | 4.5 |
| Patch diameter (inches) | 4.5 |
| Pilot diameter (inches) | 3.75 |
| Hole size diameter (inches) | 3.75 |
- What are the dimensions of the 4-1/2" black patch? The 4-1/2" Black Patch has a 3-3/4" hole size, a 3.75" pilot, and a 4.50" outside diameter.
- What is the part number for this black patch? The part number for this 4-1/2" Black Patch is 69LB.
- Who is the vendor for this tank fitting? The vendor for this tank fitting is CPI.
- Is this black patch suitable for a 3-3/4" hole? Yes, this black patch is designed for a 3-3/4" hole size.
- What type of product is the 4-1/2" black patch? The 4-1/2" Black Patch is a type of tank fitting.
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.