Why the sliding collar? Does that hold it on hands-free to my straight fitting on my ancient grease gun? Otherwise, why have the collar?

The collar is add reassurance to the connection to whatever coupler you are using. Whether you are using a LockNLube Coupler or a standard push and click coupler it is to reassure the connection stays straight while using the adapter

Will this work with mini-size grease nipples like those used on lieaner bearing blocks?

Short answer is no. I had ordered this product to use on various hard to get to zert fittings. The attachment to your grease gun on this fitting does not clamp down tight enough, and when you apply pressure by putting grease into a fitting it leaks. I returned it for a full refund

how do you tighten it onto the zerk? Do you have to hold it onto the zerk when you pump?

The 90° adapter unfortunately does not work like the other Lock N Lube grease gun heads, where they grip the Zerk. In tight places, the Lock N Lube grease heads don't fit. The 90° adapter acts like any other grease gun head (but it's easy to use, it attaches right to the Lock N Lube grease gun head - you don't have to change the grease heads). What I do is apply some pressure to the 90° part (like you often have to do when using regular grease gun heads - that's the point to using the Lock N Lube heads, they grip the Zerk tightly). For me, it works well with a little pressure on it, and it takes a second to snap it on to the Lock N Lube head.

Are the plastic sections that snap onto the zert replaceable? Evidently mine were lost the first time I used it.

Hi, Unfortunately we do not offer those pieces separately. However if you would like to call in (603)795-2298, or email us sales@locknlube.com we would be happy to get you out a warranty replacement adaptor for the one you have that is no longer usable.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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LockNLube 90 Degree Grease Coupler Adapter

LockNLube 90 Degree Grease Coupler Adapter

Product ID: 137205879

Details

Brand
LockNLube
Color
Silver
Connector Type
Zerk Fitting
Exterior Finish
Stainless
Item Weight
0.1 Pounds
Item dimensions L x W x H
3.5 x 1 x 1.25

🔩3 hardened steel jaws for max grip

↪️90° right angle for tight spaces

🛡️spring-loaded collar ensures leak-proof lock

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Description

🔧 Lock it. Lube it. Love it. The pro’s choice for precision greasing.

BUILT TO LAST - Durable stainless steel finish resists wear, backed by rebuildable parts for longevity.
UNBREAKABLE GRIP - Triple hardened steel jaws lock in tight for zero slip.
SPACE SAVVY DESIGN - 90-degree angle adapter conquers the toughest, tightest spots.
LEAK PROOF CONFIDENCE - Spring-loaded collar and rubber seal keep grease exactly where it belongs.
EFFORTLESS COMPATIBILITY - Seamlessly connects with LockNLube and other Zerk couplers for versatile use.

The LockNLube 90 Degree Grease Coupler Adapter is a compact, stainless steel tool engineered for professional-grade lubrication. Featuring three hardened steel jaws, a spring-loaded collar, and a rubber seal with check valve, it guarantees a secure, leak-proof connection to Zerk fittings—even in the tightest spaces thanks to its 90-degree angle design. Trusted by thousands with a 4.4-star rating, it’s the essential upgrade for anyone serious about efficient, mess-free greasing.

Specifications

ASIN	B07STDDN1S
Best Sellers Rank	#3,535 in Automotive ( See Top 100 in Automotive ) #54 in Fuel Transfer & Lubrication Products
Brand Name	LockNLube
Color	Silver
Connector Type	Zerk Fitting
Customer Reviews	4.4 4.4 out of 5 stars (1,871)
Exterior Finish	Stainless Steel
Global Trade Identification Number	00084282640482
Item Dimensions	3.5 x 1 x 1.25 inches
Item Type Name	90 Degree Grease Coupler Adapter
Item Weight	0.1 Pounds
Manufacturer	LockNLube
Manufacturer Part Number	LNL120
Material Type	Metal
Model Number	LNL120
Number of Pieces	1
Size	Small
Thread Type	NPT
UPC	084282640482
Unit Count	1 Count

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