These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Morrison Bros. · Air System
603ALV0900AV
In stock · ships from Knoxville
This is a 3-inch tank truck emergency valve with a Victaulic (grooved) outlet and Viton® (FKM) seals, part of the Morrison Bros.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 3 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Not specific to a truck make/model; fits any tank trailer plumbed with a standard 3-inch Victaulic connection. Verify that the Viton seal material is compatible with the carried product.
Part data verified against 5 catalog sources
Different year, make, or config? Get a confirmation against your truck in under a minute.
603 series. It is typically mounted at the bottom of a cargo tank on fuel, chemical, or dry bulk trailers to act as a primary shutoff. The valve incorporates an integrated shear section that breaks away during a collision or rollover, automatically slamming the poppet closed to contain the product inside the tank [morbros.com]. A 250°F fusible plate provides fire safety by closing the valve in extreme heat. Replacement is common after the shear section has been triggered, when the Viton seal wears out, or during required inspection/service of the trailer’s emergency shutoff system [westechequipment.com].
Part Number: 603ALV0900AV
3 EMERGENCY VALVE, VITAULIC, VITON TRIM
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
Parts commonly needed alongside air system