Does the Presta valve adapter have a valve core depressor? I want to know is whether a pressure gauge attached to the chuck will show tire pressure

Yes, this can function with gauges and inflators as long as the fitting are 1/4 npt. Hope this helps.

If i purchase new 2.0 compressor can i attach this chuck direct to compressor hose like i do with a schader ball chuck. If it has auto stop built in.

This Jaco Lightning air chuck does have auto stop. When removed from tire, air does not escape. She threads onto hose for secure fit, using standard teflon tape or putty to seal the threads. Surprisingly high quality product, metal chromed body, not plastic, made in USA. Highly recommended.

I have a lezyne floor pump with abs-1 pro chuck. i am dissatisfied with the lezyne chuck. can i simply screw the jaco onto the lezyne?

This chuck is compatible with 1/4" NPT fittings. We recommend viewing the specs of your current item to verify the fitting.

Will this chuck still lock onto a presta valve if the valve core has been removed?

I use it this way to seat the bead on my MTB tires (Specialized Butcher 27.5 x 2.6''). Since I already remove the presta valve core to add sealant, saves a little time by just twisting on this adapter and knowing ALL of the air is going into the tire. Versus using a blow gun and worrying it may not seat if it doesn't get enough air in there fast enough.

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Description

⚡ Twist, Lock, Inflate—Dominate Every Ride with Zero Air Loss!

BUILT TO ENDURE - Crafted from military-grade aluminum alloy, engineered for all-day garage or trail performance with a lifetime warranty.
ERGONOMIC ACCESS - Right-angle 90° body with full 360° swivel head easily navigates tight wheel spokes and banishes hose tension.
DUAL VALVE MASTERY - Seamlessly switch between Presta & Schrader valves with a patented airtight twist-lock seal—no leaks, no hassle.
PRO LEVEL COMPATIBILITY - Open flow design fits inline tire inflators & gauges with universal 1/4” F-NPT threads—perfect for serious cyclists.
LIGHTNING FAST DISCONNECT - Quick-release sleeve lets you detach instantly without losing a single PSI—precision inflation made effortless.

The JACO Lightning L3-Series Air Chuck is a revolutionary 2-pack bike tire inflator tool compatible with both Presta and Schrader valves. Featuring patented AirLock™ TwistLock technology and a quick-release sleeve, it guarantees an airtight seal and zero air loss during inflation. Its 90° right-angle body with 360° swivel head ensures easy access between wheel spokes, while the durable military-grade aluminum alloy construction promises long-lasting performance backed by a lifetime warranty. Designed for use with inline tire inflators and gauges, this open flow chuck is the ultimate precision tool for professional cyclists and enthusiasts alike.

Specifications

Compatible with	Presta and Schrader Valve Stems
Shape	Round
Material Type	Aluminum alloy
Number of Pieces	2
Features	2-in-1 bike air chuck features settings for presta and schrader valve stems, Features 90 degree body with fully rotational swivel & built to last from military-grade solid steel, Ideal for all bicycle tires utilizing either Presta or Schrader valve systems, Open flow air chucks require setup with tire gauge or inflator (1/4 inch NPT) to control air flow from air compressor with precision for tire inflation. Not recommended to connect directly to air compressor hose line., Patented "AirLock" internal locking system provides 100% air tight seal to tire valve stem, Quick-release sleeve quickly disconnects chuck from tire with absolutely no air loss, Universal 1/4 inch NPT female threads for maximum compatibility to your tools
Usage	road cycles, mountain bike, fat tire bikes, etc
Batteries Included?	No
Brand	JACO Superior Products
Manufacturer	JACO Superior Products
Item model number	Q9-4IUD-QFOM
Package Dimensions	14.7 x 7.6 x 2.7 cm; 91 g
ASIN	B07ZHLX9XD

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