CNC machined from billet 6061-T6 aluminum this adapter bolts onto RWD SR20 blocks and allows the use of AN16 fittings.

This replaces the thermostat housing. Either a controllable electric water pump or external thermostat is recommended.

Anodised black to prevent corrosion.

O-ring sealed for easy installation.

The kit includes:
1x Billet Water Neck
2x M8 Stainless Bolts
2x M8 Stainless Spring Washers
1x O-ring

SKU 401-007
Shipping Weight 0.1470kg
MPN: 400011

Love the O’ring

By: on 13 March 2024
Really good stuff from EFI, got it quick, great product, AN cooling for the win.


By: on 7 August 2017
Awesome service, great product, excellent transaction.

Very happy

By: on 23 July 2015
Great quality product, easy to install and quick delivery

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