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 Ultimate M-Style Air Coupler!

ROBUST BRASS STEEL BUILD - Durable brass body with case-hardened steel drag guard resists rust and accidental uncoupling.
OPTIMIZED AIRFLOW EFFICIENCY - Delivers a powerful 40 SCFM for consistent, high-performance pneumatic tool operation.
KWIK CHANGE INTERCHANGEABILITY - Effortlessly swaps with most brands, meeting strict MIL-C-4109 military specs for trusted performance.
UNIVERSAL M STYLE COMPATIBILITY - Seamlessly connects with Milton, ColorFit, and top competitor couplers for ultimate versatility.
HIGH PRESSURE TEMPERATURE RESILIENCE - Handles up to 300 PSI and 250°F, engineered for demanding industrial environments.

The Milton S-715 Industrial Coupler is a 1/4" FNPT female brass M-Style Kwik-Change air coupler designed for professional-grade pneumatic applications. Compatible with major brands and compliant with military specs, it supports up to 300 PSI and 250°F, delivering 40 SCFM airflow. Its rugged brass construction and steel drag guard ensure durability and rust resistance, making it the industry standard for reliable, high-performance air tool connections.

Specifications

Size	1 Count (Pack of 1)
Material	Brass
Brand	Milton
Color	Red
Item dimensions L x W x H	1.96 x 0.93 x 0.93 inches
Connector Type	Coupling
Exterior Finish	Alloy Steel
Thread Type	NPT
Item Weight	0.1 Pounds
Number of Pieces	1
Global Trade Identification Number	00030937007155
Manufacturer	Milton Industries
UPC	030937007155
Part Number	S-715
Item Weight	1.6 ounces
Product Dimensions	1.96 x 0.93 x 0.93 inches
Item model number	S-715
Is Discontinued By Manufacturer	No
Style	Coupler
Finish	Brass
Power Source	Air Powered
Item Package Quantity	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	Female M-Style Coupler
Batteries Included?	No
Batteries Required?	No
Warranty Description	1-Year Limited Warranty

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