The threads of the suction hose are NPSH. I assume your PVC thread is NPT. Female NPSH threads will thread onto male NPT threads (but not vise versa). However, this is not a permanent fit as the hose threads are straight, and the NPT threads are tapered. Thread tape may be needed to prevent leaking.
Pump holds its prime after simple initial priming. Can power on and off without having to re-prime.
It is a very sturdy hose.
Smooth inside it's entire length.
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Thank you for the question, we do not make a 2 in. X 3/4 in. adapter for this hose kit.
This hose is designed to be used on the suction side of a gas pump. It is reinforced to prevent it from collapsing while pumping. Please contact the manufacturer of your pump to find out the specific mixture of gas/oil to be used for your pump.