1 1/4" Radiator Hose Reducer

• Rubber reducer steps hose diameter from 1 1/4" down to 3/4" for hose transitions

• Use with properly sized hose clamps at both ends for a secure, leak-free seal

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

• Flexible rubber construction handles engine bay heat and movement

This rubber radiator hose reducer steps hose diameter down from 1 1/4" to 3/4", giving custom cooling system installations a way to connect mismatched hose sizes or bridge a flexible hose kit to a smaller port.

This is a universal-fit reducer, directional between its two sizes — not a symmetrical fitting. Confirm which side of your installation is 1 1/4" and which is 3/4" before connecting, since the reducer only steps one direction. Rubber construction provides sealing flexibility and accommodates normal engine bay movement and heat cycling; use properly sized hose clamps on both ends, as clamps aren't included.

Sizing and Direction
This reducer connects a 1 1/4" hose on one end to a 3/4" hose on the other — it's directional, not interchangeable end-to-end. Confirm which of your two hose ends is 1 1/4" and which is 3/4" before installing.

Installation
Push each hose fully onto its matching reducer end, then secure with correctly sized hose clamps at both connections — clamps are not included with this reducer. Confirm both hose diameters match the reducer's sizes exactly before cutting or trimming hose.

Does this reducer work in either direction?
Yes — this is a passive 1 1/4"-to-3/4" hose reducer and can generally be used in either flow direction. Connect the 1 1/4" end to the matching hose or port and the 3/4" end to the corresponding smaller connection.

Does this include hose clamps?
No — hose clamps are not included. Use properly sized clamps on both ends to provide a secure, leak-resistant connection.

What is this reducer typically used for?
It's used to connect 1 1/4" and 3/4" cooling-system connections, making it useful for flexible hose kits, custom cooling-system routing, and components with different-size hose ports.

Can this be used for heater hose as well as radiator hose?
Yes, provided your application requires a 1 1/4"-to-3/4" transition and the reducer is suitable for the cooling system's temperature and pressure. Verify both connection sizes before ordering.

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