Cart 0

Water Necks & Adapters

Billet water necks, fill tanks and AN water pump adapters for rotary cooling systems.

Rotary electric water pump adapter with built-in fill neck

Rotary Electric Water Pump Adapter with Fill Neck 12A/13B
Rotary 2-bolt upper water pump AN adapter flange, 16AN and 20AN

Rotary + RX-8 Upper Water Pump AN Adapter 16/20AN
Rotary billet water adapter with -16AN fittings and temp sensor port

Rotary Billet Water Adapter -16AN with Temp Sensor Port
RX-7 FC S5 billet water neck, keeps the factory thermostat

RX-7 FC S5 Billet Water Neck — Mazda 13B
RX-7 FC S4 billet water neck, keeps the factory thermostat

RX-7 FC S4 Billet Water Neck — Mazda 13B
Sold Out
RX-7 FD S6 Billet Water Neck with Fill Tank

RX-7 FD S6 Billet Water Neck with Fill Tank
RX-7 FC S4 billet water neck with integrated fill tank

RX-7 FC S4 Billet Water Neck with Fill Tank
RX-7 FC S5 billet water neck with integrated fill tank

RX-7 FC S5 Billet Water Neck with Fill Tank
RX-7 FC S5 billet 16AN water pump housing adapter, 3-bolt

RX-7 FC S5 16AN Water Pump Housing Adapter (3-Bolt)