MEC ME990-3F-500 3″ 300# Flanged Internal Valve 500 GPM Propane LP

The MEC Marshall Excelsior ME990-3F-500 Internal Valve is a heavy-duty, high-flow propane tank valve engineered for large-capacity bulk storage and transfer applications. Featuring a 3″ 300-lb flanged connection and a 500 GPM flow rating, this valve is designed for demanding industrial and commercial LP gas systems.This internal valve mounts directly inside propane storage tanks, providing secure flow control and protection while supporting high-volume liquid propane transfer. The robust cast body and precision-machined internals ensure long service life in bulk plant and transport tank environments.Manufactured by MEC / Marshall Excelsior, this valve meets the expectations of professionals who require reliable performance, safety, and OEM quality.Key Benefits:3″ flanged internal tank valve300# flange ratingHigh-capacity 500 GPM flowDesigned for propane & LP gas liquid serviceIdeal for bulk tanks and transport systemsTypical Applications:Propane bulk storage tanksTransport tank installationsHigh-flow LP gas transfer systemsIndustrial propane facilities

Important Notice – Propane Parts, Accessories, and Regulators

This product, including but not limited to propane parts, accessories, fittings, hoses, valves, and regulators, must be installed and serviced by a licensed professional in accordance with all applicable local, state, and federal codes, regulations, and standards.

The seller assumes no responsibility for the installation, inspection, application, maintenance, or use of this product.

It is the sole responsibility of the buyer to ensure the product is appropriate for their intended application and that it is installed correctly by a qualified individual.

Improper installation, maintenance, or use of propane products may result in serious injury, death, fire, explosion, or property damage.

The buyer accepts all risks, liabilities, and potential consequences associated with the use of this product.

By purchasing this item, the buyer acknowledges that they have read, understood, and agreed to these terms and confirm that installation and use will be conducted by a properly licensed and qualified professional.