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The ASC Engineered Solutions 390038479 is a Gruvlok grooved x male pipe thread (MPT) swaged nipple designed for use in grooved piping systems. This fitting transitions from a 3-inch grooved end to a 1-inch MPT connection, making it a practical component in fire protection, HVAC hydronic, and industrial piping installations. Constructed from ductile iron, it provides reliable strength and durability under normal service pressures. This type of fitting is typically installed by licensed pipefitters, mechanical contractors, or fire protection specialists working with grooved mechanical coupling systems.
This swaged nipple is suited for applications where a grooved mechanical coupling system must transition to a threaded branch or outlet connection. Common installation scenarios include hydronic heating and cooling distribution, fire sprinkler branch lines, and industrial process piping. The reducer configuration — 3 inches grooved inlet to 1 inch MPT outlet — accommodates standard branch takeoffs from main distribution lines.
Designed as a grooved x MPT swaged nipple for use with standard grooved mechanical coupling systems on Schedule 10 and Schedule 40 pipe in applicable sizes. No specific compatible model numbers were provided in the product data.
Installation should be performed by a qualified pipefitter or mechanical contractor familiar with grooved piping systems. Depressurize and drain the system completely before disassembling any grooved couplings or threaded connections. Ensure pipe ends are properly cut, reamed, and grooved to manufacturer specifications before seating the grooved end of this fitting. Apply appropriate thread sealant to the MPT end per applicable plumbing or mechanical codes.
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