Solid Brass Tee 3/8-24 Female Inverted Flare Tee On 2 Sides For 3/16" Brake Lines & 1/8 NPT Female For Using A Brake Light Switch. Match the thread and flare type to the lines being connected. is important that both flare type and thread match for a leak-proof connection. SAE 3/16 Tube size x 3/8-24 & 1/8 NPT thread size