Product guide

Milton S-99705 Safety Coupler, 1/4-inch Female NPT

The Milton S-99705 Safety Coupler is a red-button M-style air coupler listed with a 1/4-inch female NPT connection. Its two-step release is intended to stop airflow before the plug is released, while customer feedback flags durability and jamming concerns.

At a glance

The description identifies it as an M-style safety coupler with a 1/4-inch female NPT connection.
The listed release sequence is push once to stop airflow, then push twice to release the plug.
A red button is described as an identification aid.

Price

$21.34Save 29%

Reference price: ~~$30.21~~

Price checked: Nov 13, 2026

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Often bought together

Milton S-219 M Style Safety Coupler Kit

$38.65

Milton Industries ColorFit Coupler & Plug Kit - (M-Style, Red) - 1/4" NPT, (14-Piece)

$29.33

Pros and cons

Pros

Two-step release is designed to stop airflow before disconnecting the plug.
The listed female NPT connection and M-style designation help buyers compare it with their air-line fittings.

Cons

Customer feedback reports some fittings breaking after short use and instances of jamming.

Technical specifications

14 specifications

Identity
Brand	Milton
Model	S-99705

Connection and use
Connector type	Coupling
Thread type	NPT
Connection described	1/4" Female NPT
Style described	M Style
Basic flow size	1/4"
Air flow	36 SCFM

Dimensions and installation
Dimensions listed	12.2 x 12.2 x 3.3 centimetres
Weight listed	113 g
Size listed	0.54 inches

Materials and appearance
Material listed	1
Exterior finish	Alloy Steel
Colour	Red

What to know before buying

Listing details to confirm

The listing gives a general size of 0.54 inches alongside separate dimensions of 12.2 x 12.2 x 3.3 centimetres, and lists material as "1" while separately naming an Alloy Steel exterior finish. Confirm the intended size and material details if they are important to fit or selection.

Who is it for?

A good fit for

Buyers seeking a single M-style air coupler with a listed 1/4-inch female NPT connection.
Users who want a coupler described with a staged airflow-stop and plug-release sequence.

Less suited to

Buyers who need established durability evidence or want to avoid the reported jamming concerns.

Customer reviews on Amazon

4.2 / 5 · 108 ratings

5 stars72%72%
4 stars7%7%
3 stars6%6%
2 stars1%1%
1 star14%14%

Customer feedback describes effective operation, including use with high-pressure air, but also reports fittings breaking after short use and jamming. Opinions on quality, compatibility and air resistance are mixed. These accounts matter for buyers relying on frequent connections, though the supplied listing does not establish how consistently those issues occur or confirm this coupler's performance at a particular pressure.

Positive themes

Feedback describes the fitting as working effectively.

Negative themes

Feedback reports breakage after short use and jamming.

Mixed feedback

Feedback is mixed on quality, compatibility and air resistance.

Frequently asked questions

What connection does the listing describe?

It describes an M-style coupler with a 1/4-inch female NPT connection. Check that this matches the plug and air-line fittings you plan to use.

How is the safety release described?

The listing says to push once to stop airflow and push twice to release the plug.

What should I know about customer feedback?

Feedback describes effective operation but also reports durability problems and jamming. Experiences with quality, compatibility and air resistance are mixed.