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

🔩 Connect Fast, Work Smart – The Pro’s Choice in Pneumatic Couplers!

ROBUST BRASS CONSTRUCTION - Durable brass body with Buna-N seals resists rust and wear for long-lasting performance.
COMPACT LIGHTWEIGHT DESIGN - Sleek 45g profile fits tight spaces, perfect for on-the-go pros who value efficiency.
KWIK CHANGE INTERCHANGEABILITY - Military-spec compliant design ensures quick swaps across brands without downtime.
UNIVERSAL M STYLE COMPATIBILITY - Seamlessly fits all Milton and competitor M-style couplers for effortless integration.
HIGH PRESSURE TEMPERATURE TOLERANCE - Handles up to 300 PSI and 250°F, built for demanding professional environments.

The Milton (S-715) 1/4" FNPT Female M-Style KWIK-CHANGE Coupler is the industry-standard pneumatic connector trusted by professionals. Crafted from durable brass with Buna-N seals, it supports up to 300 PSI and 40 SCFM airflow, while withstanding temperatures up to 250°F. Its military-spec compliant, interchangeable design ensures seamless compatibility with most manufacturers, making it an essential, reliable tool for any serious pneumatic setup.

Specifications

Manufacturer	Milton Industries
Part number	S-715
Item Weight	45.4 g
Product Dimensions	4.98 x 2.36 x 2.36 cm; 45.36 g
Item model number	S-715
Size	Single
Color	Red
Style	Coupler
Finish	Brass
Material	Brass
Power source type	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

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