My 10+ year old s-715 hisses, even after installing new s-727 plugs. does the very small o-ring in this s-715 eventually wear out?

Yes, orings can get old and less plyable so they will not seal as well

is this for high pressure propane on an RV tank?

The model number S-715 will be an air style fitting. The maximum pressure will be 300 PSI.

Mine says made in USA on packaging. Nothing listed on the part itself. I like mine, purchased several and all work good. Would buy again.

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Milton S-715-4 1/4" FNPT M Style Coupler - Pack of 4

Milton S-715-4 1/4" FNPT M Style Coupler - Pack of 4

Product ID: 115876472

Details

Brand
Milton
Colour
Gold
Connector type
Coupling
Exterior finish
Brass
Item dimensions L x W x H
12.1 x 10.2 x
Item weight
0.24 Pounds

💨40 SCFM airflow power

🔥250°F max temp endurance

🔩1/4" FNPT thread precision

S$97

Duties & taxes included

In stock

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Description

⚙️ Elevate your toolkit with precision-engineered couplers that mean business!

HIGH PRESSURE RESILIENCE - Withstands up to 300 PSI to keep your projects running strong.
DURABLE BRASS CONSTRUCTION - Premium brass body and sleeve ensure long-lasting reliability and corrosion resistance.
OPTIMAL AIRFLOW EFFICIENCY - Delivers a robust 40 SCFM for peak pneumatic performance.
MILITARY GRADE COMPATIBILITY - Seamlessly fits all MIL-C-4109 spec tools for ultimate versatility.
BUNA N SEALS FOR LEAK FREE OPERATION - Engineered for airtight connections, minimizing downtime and maximizing productivity.

The Milton S-715-4 pack of four 1/4" FNPT M Style couplers offers military-spec compatibility, supporting up to 300 PSI pressure and 40 SCFM airflow. Crafted from durable brass with Buna-N seals, these couplers ensure reliable, leak-free pneumatic connections capable of withstanding temperatures up to 250°F. Perfect for professionals demanding efficiency and durability in their air tool accessories.

Specifications

ASIN	B00YJ8PDJW
Best Sellers Rank	908,687 in DIY & Tools ( See Top 100 in DIY & Tools ) 4,966 in Air Tool Accessories
Brand	Milton
Colour	Gold
Connector Type	Coupling
Customer Reviews	4.6 4.6 out of 5 stars (2,053)
Exterior Finish	Brass
Global Trade Identification Number	00030937314246
Included Components	1 Milton Branded Product
Item Dimensions	12.1 x 10.2 x 3.8 centimetres
Item Type Name	Milton s-715-4 1/4" Fem. Body M-Style 4-pack
Item Weight	0.24 Pounds
Manufacturer	Milton
Material	Brass
Model Number	S-715-4
Number of Pieces	4
Part Number	S-715-4
Size	pack of 4
Thread Size	0.25 inch
Thread Type	NPT
UPC	030937314246
Unit Count	1.0 count

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