2" Radiator Hose Adapter with 1 1/2" Reducer

• Rubber adapter steps hose diameter from 2" down to 1 1/2" for hose transitions

• Hose clamps included for both connections — no separate clamps needed

• Universal fit for radiator or heater hose runs needing this diameter step-down

• Flexible rubber construction handles engine bay heat and movement

This rubber radiator hose adapter steps hose diameter down from 2" to 1 1/2", giving custom cooling system installations a way to connect mismatched hose sizes or bridge a flexible hose kit to a smaller port. Hose clamps are included for both connections.

This is a universal-fit adapter, directional between its two sizes — not a symmetrical fitting. Confirm which side of your installation is 2" and which is 1 1/2" before connecting, since the adapter only steps one direction. Rubber construction provides sealing flexibility and accommodates normal engine bay movement and heat cycling.

Sizing and Direction
This adapter connects a 2" hose on one end to a 1 1/2" hose on the other — it's directional, not interchangeable end-to-end. Confirm which of your two hose ends is 2" and which is 1 1/2" before installing.

Installation
Push each hose fully onto its matching adapter end before clamping. Hose clamps are included for both connections, so no separate clamps need to be sourced. Confirm both hose diameters match the adapter's sizes exactly before cutting or trimming hose.

Does this adapter work in either direction?
Yes — this is a passive 2"-to-1 1/2" hose reducer and can generally be used in either flow direction. Connect the 2" end to the matching hose or port and the 1 1/2" end to the smaller connection.

Does this include hose clamps?
Yes — hose clamps are included for securing both connections.

What is this adapter typically used for?
It's used to connect a 2" cooling-system hose to a smaller 1 1/2" connection, making it useful for flexible hose kits, custom radiator plumbing, and other cooling-system components with different port sizes.

Can this be used for heater hose as well as radiator hose?
Yes, provided your application requires a 2"-to-1 1/2" transition and the adapter is suitable for the cooling system's temperature and pressure. These large sizes are more commonly associated with radiator or custom cooling-system plumbing than typical heater hoses.

What material is this adapter made from?
It's made from black rubber.