KOHLER Silent Fill Toilet Valve Kit GP1138930 – Adjustable Fill-Rate Inserts

Product Overview

Upgrade your toilet performance with the KOHLER Silent Fill Toilet Valve Kit GP1138930. As a genuine KOHLER part designed by engineers, this kit aims to preserve original tank behavior while delivering a calmer, more consistent refill. It is built to pair with Kohler Class 5 toilets, helping restore efficient operation without the disruptive sounds common to older setups.

Silent Fill Technology stands at the center of this kit, providing a gracious refill that minimizes nighttime and morning noise. In addition, the set includes multiple fill-rate inserts, enabling you to tailor how quickly the tank refills. That flexibility supports a balance between dependable performance and thoughtful water use, so you can adapt the system to your home and preferences without guessing at the right settings.

Key Benefits

• Quiet tank refill reduces disturbance during flush cycles
• Adjustable fill-rate inserts offer flexible performance and water-management control
• Genuine KOHLER PART designed to sustain original toilet performance
• Class 5 compatibility supports a reliable match with compatible Kohler models

Compatibility and Maintenance

• Designed for Kohler Class 5 toilets; confirm shank color to ensure correct part
• If shank color is grey, this GP1138930 part applies; if black, GP1083167 is recommended
• Cap color may vary; avoid abrasive cleaners to protect surfaces

What’s Included and How It Helps

The kit ships with multiple fill-rate inserts to optimize the refill sequence for your unit, supporting steady performance and opportunities to conserve water without changing the fundamental flush behavior.

In everyday use, you may notice a calmer refilling phase after a flush, and you can adjust the inserts to suit your home’s water pressure and rinse cycles. This is a genuine part intended to restore intended performance and align with Kohler’s Class 5 design language, while remaining compatible with modern bathroom aesthetics.

How It Works

The adjustable inserts control the refill flow, letting you fine-tune fill speed to your toilet’s needs. Start with a baseline setting and gradually adapt to achieve the balance you prefer for quiet operation and efficient water use.

Care for the valve by avoiding harsh cleaners on exposed surfaces and following standard maintenance practices for plumbing components.