The Hydra-Stop HSF 250 Patriot Line Stop fitting is a step forward in line stopping technology. The HSF 250 line stop fitting incorporates features that matter most to our customers — 250 psi working pressure, American Iron and Steel Act compliant, UL NSF 61 Classified, Heavy Duty Stainless Steel Construction and a Push and Pin Completion Plug system.

Device The HSF 250 Patriot water main line stop fittings are NSF 61 and ANSI 372 certified by Underwriters Laboratories, Inc. to be used as a fully UL® compliant component of water systems in the United States. (10" and 12" certification pending.)

NSF/ANSI Standard 61 was established to provide minimum requirements for the control of potential adverse human health effects from products that contact drinking water. This includes criteria for testing and evaluating products to ensure they do not leach potentially harmful contaminants into the water system.


The HSF 250 Patriot line stop fitting is manufactured in the USA. It meets American Iron and Steel Requirements (Public Law 113-76) and fulfills requirements specified in additional “Buy American” legislation. It meets “Made in USA” and “Buy America” requirements with the additional purchase of stainless steel domestic hardware.

Compare for yourself. When specifying your next line stop fitting, specify the HSF 250 Patriot Line Stop Fitting. The HSF 250 Patriot is the ONLY line stop fitting which offers all the following features as standard:


Each HSF 250 fitting is factory pressure tested and serialized for traceability before leaving our facility. The blind flange and fitting body arrive ready to be placed on the pipe for pressure testing. The nylon “Push and Pin” completion plug saves installation time and eliminates the possibility of a cross threaded completion plug. Other time saving features such as integrated lifting gussets, drop in bolts and slotted flange make for safe, quick and simplified installations.

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