Identify CURT Receiver Reducers & Adapters

When a CURT receiver insert is missing, its purpose helps identify the replacement. A short reducer sleeve sits inside a larger hitch, while some adapters add reach or move the receiver vertically. Start with the original receiver opening, the accessory shank size and the manufacturer number, not just the black steel finish.

Three physical designs to identify

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.

How to identify the original sleeve or adapter

Photograph the original receiver opening, inserted sleeve and retaining pin if still present.
Measure both square dimensions: for example, 45409 is 3-inch to 2½-inch, while 45410 is 3-inch to 2-inch.
Identify whether the original consisted of one piece or two nested sleeves, as in 45408.
Check whether the missing part changed hitch length or height: 45770 adds reach and 45798 changes height.
Follow the correct pin specification and manufacturer towing/load limitations before using the adapter.

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.

Match the existing receiver to the shank

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.

View exact part numbers and product photos

Compare the manufacturer number and photo, and check each UsedRVParts listing for condition and availability.

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 inA single, short 2½-to-2-inch reducer sleeve. Check its opening and original receiver rather than using an extension.Check product and availability

CURT 45408 nested reducer set hitch adapter product photograph

CURT 45408 — 3 in to 2½ or 2 inIdentify two separate nested inserts rather than a one-piece sleeve. Check that both pieces are present when required.Check product and availability

CURT 45409 single reducer sleeve hitch adapter product photograph

CURT 45409 — 3 in to 2½ inA single 3-to-2½-inch reducer. Its shape can resemble part of the 45408 set; verify the full MPN.Check product and availability

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

CURT 45410 — 3 in to 2 inLonger one-piece 3-to-2-inch reducer rather than a two-piece nested set. Check the pin-hole alignment.Check product and availability

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

CURT 45411 — 2 in to 1¼ inSmall 1¼-inch internal opening and half-inch pin hole distinguish this from the larger sleeves.Check 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 inA reducer that also adds four inches of reach. Unlike a plain sleeve, CURT provides separate 3,500-lb GTW/350-lb TW ratings.Check 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 inA bent high-low adapter that preserves a two-inch receiver size while shifting height by four inches. It is not a reducer sleeve.Check 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.

UsedRVParts viewing and pickup are by appointment in Kelowna. Check the individual listing for condition.

Inventaire de pièces détachées pour VR, nouveau et mis à jour – Consultez-le régulièrement

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Identify CURT Hitch Receiver Reducers, Adapters & Rise/Drop