CURT Reducer Sleeves & Hitch Adapters

CURT receiver adapters serve three different purposes: a reducer sleeve changes the opening size within a receiver, an adapter/extender can add rear clearance, and a high-low adapter changes the receiver height. To find the correct product, match both square dimensions, the pin hole and the intended towing or accessory use.

Choose the right receiver adapter design

Reducer sleeve Fits inside the original hitch opening and reduces its size, without creating a separate rear receiver body.

Adapter with added reach A receiver adapter that also provides clearance behind the bumper. Check its separate capacity limit.

High-low receiver adapter Offsets the receiver vertically while keeping the same nominal shank opening. Confirm intended towing geometry.

Simplified identification graphics, not scale drawings or mounting instructions.

The hitch rating still governs. CURT reducer sleeves 45405 and 45408–45411 carry limits based on the original hitch and other towing components. CURT 45770 and 45798 have their own manufacturer ratings, so neither automatically inherits the full rating of a larger original receiver.

CURT reducer and adapter size chart

CURT MPN	Original receiver	Accepted shank	Distinguishing feature
45405	2½ in	2 in	Single reducer sleeve · 5½ in long
45408	3 in	2½ or 2 in	Nested reducer set · Two sleeves
45409	3 in	2½ in	Single reducer sleeve · 5½ in long
45410	3 in	2 in	One-piece with ⅝-in pin hole · 6¾ in long
45411	2 in	1¼ in	One-piece with ½-in pin hole · 4 in long
45770	2 in	1¼ in	Rated adapter/extender · 4 in added clearance
45798	2 in	2 in	High-low adapter · 4-in rise or drop

Inside receiver size and hitch shank size are different from the hitch pin diameter. Follow CURT's instructions for the exact pin hole and assembly.

Five checks before selecting a CURT receiver adapter

Measure the receiver's inside opening first: 2-inch, 2½-inch or 3-inch tubes require different inserts.
Measure the accessory shank. For 45408, confirm whether you need one sleeve or both nested sleeves.
Check the receiver pin-hole position and specified pin diameter: 45410 uses a ⅝-inch hole; 45411 uses a ½-inch hole.
If additional rear clearance is needed, CURT 45770 provides four inches, with a 3,500-lb GTW and 350-lb tongue-weight rating.
Where height adjustment is needed, CURT 45798 provides four inches of drop or rise with its own towing specifications; verify the entire towbar and vehicle arrangement.

Special towing geometry. CURT identifies 45798 as a high-low adapter with a 7,500-lb gross towed-vehicle rating. For dinghy towing, CURT instructs that the receiver and vehicle baseplate connections be kept within three inches of level. Confirm all components and the appropriate installation.

Compare CURT receiver sleeves and adapters

Open the matching NewRVParts product to review current availability and the exact design.

Reducer sleeve

Fits inside the original hitch opening and reduces its size, without creating a separate rear receiver body.

CURT 45405 — 2½ in to 2 inOne carbon-steel sleeve allows a 2-inch shank in an existing 2½-inch receiver. CURT says its capacity is limited by the hitch.View product and availability

CURT 45408 nested reducer set hitch adapter product photograph

CURT 45408 — 3 in to 2½ or 2 inTwo nested sleeves: together 3-to-2 inches, outer sleeve 3-to-2½ inches, inner sleeve 2½-to-2 inches. Rated only to the applicable hitch limit.View product and availability

CURT 45409 single reducer sleeve hitch adapter product photograph

CURT 45409 — 3 in to 2½ inA one-piece steel reduction from a 3-inch receiver to a 2½-inch shank, without the second sleeve supplied in CURT 45408.View product and availability

CURT 45410 one-piece with ⅝-in pin hole hitch adapter product photograph

CURT 45410 — 3 in to 2 inOne-piece 3-to-2-inch steel reducer with a six-and-three-quarter-inch body and a ⅝-inch pin hole; usable weight stays within hitch limits.View product and availability

CURT 45411 one-piece with ½-in pin hole hitch adapter product photograph

CURT 45411 — 2 in to 1¼ inFour-inch 2-to-1¼-inch sleeve with a half-inch pin hole. Use the correct pin and observe the original hitch limits.View product and availability

Adapter with added reach

A receiver adapter that also provides clearance behind the bumper. Check its separate capacity limit.

CURT 45770 rated adapter/extender hitch adapter product photograph

CURT 45770 — 2 in to 1¼ inAdapts a 2-inch receiver to a 1¼-inch shank while adding four inches of clearance. CURT rates it 3,500 lb GTW and 350 lb TW, subject to the lowest-rated component.View product and availability

High-low receiver adapter

Offsets the receiver vertically while keeping the same nominal shank opening. Confirm intended towing geometry.

CURT 45798 high-low adapter hitch adapter product photograph

CURT 45798 — 2 in to 2 inChanges receiver height by four inches up or down for suitable towing connections. CURT rates it to 7,500 lb gross towed-vehicle weight; verify the exact intended tow setup.View product and availability

Related towing components

Need to extend the hitch or control rattling rather than reduce receiver size? Compare CURT extenders and anti-rattle hardware.

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CURT Hitch Reducer Sleeves vs Receiver Adapters: Size Guide