Hose barb adapter - 1-3/4 hose with 1/4 NPT port

Swagelok Adapter 3/4 inch hose barb to 3/4 inch ID Male NPT, Stainless Steel, PN: SS-12-HC-1-12

For 1-1/4 Hose 1/8NPT Aluminum Steam Port Adapter Top Radiator LS Swap Coolant

1-1/4 to 1-1/2 Hose w/ 1/8NPT Steam Port Adapter Top Radiator LS Sw – Malex Motorsports Australia

Pipe Fitting - 316 Stainless Steel - Class 150 - Hex Nipple - 1-1/4 NPT Male

Radium 14-0062 In-Line Hose Barb Adapter for 1-3/4 44.5mm 1/4 NPT Sensor Port

Areyourshop 1-1/4 Hose w/ 1/8 NPT Steam Port Adapter Top Radiator LS Swap Coolant Car Accessories Parts - AliExpress

1-3/4 to 1-1/4 Hose Barb Adapter Reducer Fitting

1/4 Fitting X 1/4 NPT Copper Female Street Adapter — COPPERTUBINGSALES

Hose barb adapter - 1-3/4 hose with 1/4 NPT port