Larsen Supply S-521-2NL Cold Deck Stem Kohler 3512

Product Description

The LARSEN SUPPLY CO., INC. S-521-2NL is a cold-side deck stem designed to replace the Kohler 3512 stem in lavatory and kitchen faucet applications. Constructed from brass with an I-broach configuration, this stem delivers reliable shutoff and flow control in deck-mounted faucet bodies. It meets Vermont and California AB-1953 no-lead compliance requirements, making it suitable for potable water installations where lead-free materials are mandated by code. Licensed plumbers and experienced service technicians install this stem as a direct OEM-style replacement when a faucet leaks or fails to seat properly at the cold-side valve.

This stem is intended for residential and light commercial lavatory and kitchen deck faucets originally fitted with the Kohler 3512 cold stem. Typical applications include bathroom vanity faucets and kitchen sink faucets where the existing stem has worn seats, damaged threads, or a deteriorated packing that causes dripping. The I-broach drive pattern must match the faucet handle interface before installation. Sold individually per card, with a package quantity of six cards per case for shop or distributor stocking.

Key Features

• Brass construction provides corrosion resistance and long service life in potable water systems
• I-broach configuration for proper handle engagement on compatible Kohler faucet bodies
• Cold-side designation — verify hot or cold orientation before ordering
• Vermont and California AB-1953 no-lead compliant for use in drinking water applications
• Sold one stem per card; case pack of six available for stocking

Compatibility

Designed as a replacement for the Kohler 3512 cold deck stem in lavatory and kitchen deck-mounted faucet assemblies. Verify the I-broach drive pattern and stem geometry against the existing faucet body before installation.

Installation Notes

Installation should be performed by a licensed plumber. Shut off the water supply at the fixture stop valves or the main shutoff and relieve pressure before disassembling the faucet. Use an appropriately sized stem socket or basin wrench to remove and reinstall the stem without damaging the faucet body threads. Confirm the replacement stem seats fully and that packing or O-rings are in good condition before restoring water pressure and checking for leaks.