Pipe King suction and lay flat hose round hole steel strainer and combination hose nipple set. The round hole steel strainer and nipple can be used with lay flat and suction hoses. They are both plated steel with standard straight pipe threads. The strainer helps prevent debris from entering a suction line. The thread Type is npsn. The steel combination nipple is recommended for low pressure discharge and suction service for liquids. The male side of this adapter will only connect to a female National pipe straight hose (npsh) or National pipe tapered (NPT) thread. The shank side of the nipple will only connect into the suction or lay flat hose.