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Waterside Gasket Kits
These precision waterside gasket kits provide reliable, leak-proof performance for essential industrial boiler maintenance.
We have a full inventory of OEM-compatible waterside gasket kits at all sizes and horsepower requirements.
Part # | Diameter | Model | HP Range
- 880-212Manway11 inch x 15 inch125-800 HP
- 880-210High Pressure, Manhole Flexitallic Gasket11 inch x 15 inch125-800 HP
- 880-212BManway11 inch x 15 inch & 12 inch x 16 inch125-800 HP
- 880-212AManway12 inch x 16 inch125-800 HP
- 880-212LManway & Level Master Gasket12 inch x 16 inch125-800 HP
- 880-210AHigh Pressure, Manhole Flexitallic Gasket12 inc x 16 inch
- 880-204Handhole & LWCO Gaskets15-40 HP
- 880-209Handhole & LWCO Gaskets50-100 HP
- 880-FLX-HWFlextube - Hot Water
- 880-FLX-STFlextube - Steam
In-stock items. Order by 2:00 PM EST for Same-Day Shipping.
Need help finding the right gasket kit?
We have expert-level staff ready to assist you.

Frequently Asked Questions About Waterside Gasket Kits
What is a waterside gasket kit and what is its primary role?
A waterside gasket kit is a precision-packaged set of heavy-duty sealing components engineered specifically for the water and steam containment surfaces of an industrial boiler. Its primary role is to combine reliable pressure containment with exceptional water security. By establishing robust seals around essential entry points—such as handhole and manhole inspection covers—these vital boiler gasket kits prevent steam blowouts, hard-water scale accumulation, and dangerous external structural corrosion.
What are the main signs that a handhole or manhole waterside seal needs to be replaced?
Because waterside components are continuously subjected to extreme internal pressure, chemical water treatments, and severe thermal cycling, seals degrade over time. During routine scheduled inspections or water washdowns, maintenance technicians should look for signs of hard mineral scaling around the inspection frames, localized steam leaks, or physical crushing and flattening of the elastomer or composite material. Replacing worn pieces with premium replacement waterside gasket kits stops escalating leaks from pitting the structural steel seats and forcing a total system shutdown.
Why source aftermarket waterside gasket kits from Halmar instead of an OEM?
Procuring traditional sealing sets directly from original equipment manufacturers (OEMs) often exposes commercial purchasing agents to extensive distributor friction, unnecessary markups, and long factory backorders. Halmar stands as an independent domestic manufacturer, managing strict quality control and stocking a massive pool of high-durability aftermarket gasket kits inside our modern facility in Louisville, Kentucky. We maintain a ready inventory of industry-leading brands—including flexible topog-e gaskets, resilient blue-max gaskets, and graphite-treated black-max gaskets—available for immediate same-day shipping to keep your plant infrastructure safe and online.
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