Description
GP51487 Tank Bolt Assembly Kit — Kohler Wellworth Replacement
The iFJF GP51487 tank bolt assembly kit provides everything you need to stop leaks and re-secure your Kohler toilet tank. Designed specifically for the Kohler Wellworth triangle-shaped tank-to-bowl connection, this kit replaces worn-out bolts, gaskets, and washers that cause water pooling around the base of your toilet tank.
Key Features
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Complete Kit: Includes all bolts, gaskets, washers, and nuts for a full tank-to-bowl rebuild
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Triangle Gasket Design: Precision-molded rubber gasket matches the unique Kohler Wellworth tank shape
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Corrosion-Resistant Bolts: Solid brass bolts won't rust or seize like steel alternatives
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Leak-Proof Seal: High-quality rubber washers compress evenly for a watertight fit
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Direct OEM Replacement: Identical fit to Kohler GP51487 assembly
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15-Minute Install: All parts included — no extra trips to the hardware store
Compatibility
| Brand |
Model |
Tank Shape |
| Kohler |
Wellworth |
Triangle |
| Kohler |
Wellworth Lite |
Triangle |
⚠️ Verify your tank-to-bowl connection is triangular before ordering. Standard round/oval gasket toilets require a different kit.
What's Included
| Component |
Material |
Quantity |
| Tank Bolts |
Brass |
2 |
| Flat Washers |
Stainless Steel |
2 |
| Rubber Washers |
EPDM Rubber |
2 |
| Hex Nuts |
Brass |
2 |
| Triangle Tank Gasket |
Rubber |
1 |
Signs You Need a New Tank Bolt Kit
- Water pooling around the base of the toilet tank (not the floor — that's a wax ring issue)
- Visible rust or corrosion on existing tank bolts
- Tank wobbles or shifts when you sit on the toilet
- Constant condensation or dampness at the tank-to-bowl joint
- Bolts are seized and cannot be tightened further
Installation Steps
- Shut off the water supply valve and flush to empty the tank
- Disconnect the water supply line from the fill valve
- Remove the old tank bolts — you may need penetrating oil if seized
- Lift the tank off the bowl and clean both mating surfaces thoroughly
- Remove the old gasket and any residue
- Place the new triangle gasket into the tank opening
- Insert new brass bolts through the tank holes with rubber washers underneath
- Carefully lower the tank onto the bowl, guiding the bolts through the bowl holes
- Install flat washers and nuts from below, hand-tighten evenly
- Use a wrench to snug both nuts equally — DO NOT overtighten (cracks porcelain!)
- Reconnect the water supply, turn on the valve, and check for leaks
Frequently Asked Questions
Q: How do I know if my toilet needs the triangle or round gasket?
A: The Kohler Wellworth uses a distinct triangular tank-to-bowl seal. If you shine a flashlight between the tank and bowl and see a triangular shape, this kit is correct for your toilet.
Q: Can I use this on non-Kohler toilets?
A: This kit is specifically designed for the Kohler Wellworth's unique triangle connection. It will not properly seal round-gasket toilets from other brands.
Q: How tight should I make the tank bolts?
A: Hand-tighten plus 1/4 to 1/2 turn with a wrench. Overtightening is the #1 cause of cracked toilet tanks. Tighten both bolts evenly in small increments.
Q: Do I need to replace the fill valve at the same time?
A: Not required, but if your toilet is over 5 years old, replacing the fill valve and flapper while the tank is off is a smart preventive maintenance step.
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