Your cart is empty
Browse our catalog to find the parts you need.
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.
Dixon · Hardware & Fasteners
40X30
In stock · ships from Knoxville
This is a 4-inch female camlock coupler x 3-inch male camlock adapter made of aluminum.
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
Fits any standard 4" male camlock and 3" female camlock connection. Applications are based on reported trailer uses for this part type rather than specific vehicle make/model fitment.
Part data verified against 4 catalog sources
Numbers this part supersedes or interchanges with. Showing 3 of 3.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It serves as a reducer to connect a 4-inch male camlock fitting to a 3-inch female camlock fitting, commonly found on dry bulk, crude, or gas tank trailers. You would typically replace this when the existing adapter is worn, corroded, or the Buna-N gasket is no longer sealing properly. While designed as a reducer, it's often used to couple lines of different sizes during product transfer operations.
Part Number: 40X30
4' ALUM COUPLER X 3' ADAPTER
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
