Feature●Features: Eliminates the need to shut down, drain, cut, refit and refill piping systems.Fit Valve size: 3/4 - 4-Inch.●Pressure rated 300 psi for ambient temperatures,15 psi for steam systems.(Note: Not recommended for ammonia, gas or other caustic systems)●Function: Hot tap using the DM3MECH Mechanical Hot Tapping Machine.Hot tap steel, copper, brass or aluminum pipe for installing branch connections from 3/4” to 4” valves.●Note:Applying too much force while cutting the coupon can result in a sudden break through of the hole saw. A sudden breakl through may result in the coupon retainer striking the back side of the main and damaging the retainer. One can prevent this by cutting a spacer of 3/4" copper tube long enough to stop the retainer from hitting the back of the main. Slip this spacerl over the exposed shaft between the gland nut and the drill chuck.●Satisfaction service : If you are not satisfied with our products.You can request a full refund within 30 days and support a 12 month warranty.Professional and sincere service allows you to purchase without risk!Description Hot Tapping Machine 08350 DM3MECH Hot Tap Kit for NPT Complete with Hole Saws and Arbor