Question: Where can I get Male Connector (3/16″ X 1/4″ MPT) RPF688 for Tuttnauer Model ?
Answer: You may get the Male Connector (3/16″ X 1/4″ MPT) RPF688 for Tuttnauer Model for Tuttnauer  Sterilizer model HERE

Details
1/4 MPT x 3/16″ Compression Fitting
Material: Brass
Fits: Pressure Gauge (Test)

Thank you –
~Shlomo Savyon
1-800-762-1586
Your Sterilizer expert