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Brass Push-In Tube Fitting, 0.19 Tube OD to 1/8-18 Male NPT, Straight

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Description & Features

Engineered for precision and reliability the brass push-in tube fitting features a 0.19 tube OD and 1/8-18 male NPT thread. This durable component by Alkon Corp is constructed from high-quality brass ensuring longevity and robustness in various industrial settings.

Equipped with Buna-N O-rings this fitting guarantees a secure and leak-proof connection when used with polyurethane polybutylene and soft metal tubing. The innovative design includes quick connect and disconnect capabilities as well as a pre-applied Teflon based pipe sealant on all male threads for added convenience and efficiency.

The full flow design enhances the fitting's performance and the addition of an interior hex ensures easy Allen key tightening. This fitting is suitable for vacuum service and can operate within a temperature range of -10F to 200F. Its pressure rating aligns with the maximum working pressure of the compatible thermoplastic tubing.

When the tube is inserted gripping teeth secure it while the O-ring provides a leak-proof seal. The system's design ensures that pulling back on the tube tightens the grip preventing any potential leaks.

MPN: AQ68-P-3X2

Supplier Part Number: AQ68-P-3X2

Specifications

Brand
ALKON
a Dimensions
1.04 in
b Dimensions
0.9 in
Connection Size 1
3/16 in
Connection Size 2
1/8 in
Connection Type
MNPT, Push-Fit
Connection Type 1
Push-to-Connect Tube
Connection Type 2
MNPT
d Dimensions
0.16 in
Dimensions
1.01 in L
Finish
Nickel-Plated
Fitting Type
Connector
For Use With
Polybutylene and Soft Metal Tubing
Material
Brass
Material Construction
Brass
Series
AQ Series
Sg How It Works
When Tubing (1) is Inserted into the Fitting, it First Passes Through the Gripping Teeth (2), Just Beyond the Gripping Teeth is the O-ring (3) Which Provides the Leak Proof Seal Against the OD, of the Tube, the Gripping Teeth Grab the Tube, Which Expands

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Product Questions & Answers (2)

Question by: Sheila K on Apr 7, 2026, 7:44 AM
Will this here fitting work alright with a soft copper line?
Answer by: Customer Support on Apr 9, 2026, 6:50 AM
Yes, this Alkon fitting is designed for use with soft metal tubing, along with polyurethane and polybutylene.
Question by: Jerry H on Apr 18, 2025, 10:36 AM
tubing I got is polybutylene, about 3/16 OD, will that push right into this fitting or do I need something different?
Answer by: Customer Support on Apr 20, 2025, 6:57 AM
Polybutylene tubing is one of the compatible types for this fitting, and the 0.19 inch tube OD is what it's built around. That works out to just about 3/16, so you're in the right range. When you push the tube in, the gripping teeth catch it and the Buna-N O-ring seals against the outside diameter. One thing worth knowing is the tubing needs to be in decent shape at the cut end, clean and square, so the teeth get a solid bite and the O-ring seats right.

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