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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Description

⚡ Elevate your pneumatic game with Milton’s M-Style – where precision meets power!

HEAT PRESSURE TOUGH - Engineered to withstand temperatures up to 250°F, perfect for demanding industrial environments.
INDUSTRY STANDARD M STYLE - Seamlessly compatible with Milton, ColorFit, and top competitor couplers for effortless integration.
ROBUST BRASS STEEL BUILD - Durable brass body with case-hardened steel drag guard resists rust and accidental uncoupling for long-lasting reliability.
OPTIMIZED AIRFLOW PERFORMANCE - Delivers a powerful 40 SCFM airflow at 300 PSI, maximizing efficiency for your pneumatic tools.
KWIK CHANGE INTERCHANGEABILITY - Military-spec MIL-C-4109 compliance ensures flawless fit across most manufacturers—no more compatibility headaches.

The Milton S-715 is a 1/4" FNPT female M-Style pneumatic coupler crafted from durable brass with a case-hardened steel drag guard. It supports up to 300 PSI inlet pressure and 40 SCFM airflow, operating reliably in temperatures up to 250°F. Fully compliant with military specification MIL-C-4109, it guarantees seamless compatibility with leading brands, making it the go-to choice for professionals demanding durability and performance.

Specifications

Manufacturer	Milton Industries
Part Number	S-715
Product Dimensions	4.98 x 2.36 x 2.36 cm; 45.36 g
Item model number	S-715
Size	Single
Colour	Red
Style	Coupler
Finish	Brass
Material	Brass
Power Source	Air Powered
Item Package Quantity	1
Number of Pieces	1
Measurement System	Inch
Special Features	M-STYLE: The industry standard coupler. Milton M-style, ColorFit M-style, + red competitor couplers/plugs are all compatible. -KWIK-CHANGE®: Interchangeable/compatible with most manufacturers. Compliant with military specification MIL-C-4109. -NPT: 1/4" female national pipe thread flow size. Durable brass. Buna-N seals. -MAXIMUM: 40 standard cubic feet per minute (SCFM). 300 PSI inlet pressure. Temperatures up to 250 degrees F.
Included Components	1 Milton Branded Product
Batteries included?	No
Batteries Required?	No
Item Weight	45.4 g

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