Is this compatible with the 1151 (skylake) cpu socket?

The instruction manual does not mention the LGA 1151 specifically. I don't see much of a physical difference between the two sockets but I would suggest contacting Thermaltake to make sure.

Yes it is designed to fit a wide range of CPUs

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Thermaltake Pacific CL-W027-CU00BL-A DIY LCS W2 Copper CPU Water Block

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Learn more about the Thermaltake CL-W027-CU00BL-A

Model
Brand	Thermaltake
Series	Pacific
Model	CL-W027-CU00BL-A
Type	CPU Block

Block
Block Compatibility	Intel LGA: 2011/1366/1155/1156/1150 AMD: FM2/FM1/AM3+/AM3/AM2+/AM2
Block Dim.	1.11" x 3.50" x 3.57"
Block Material	Copper

Features
Features	Optimized .25mm microfin internal structure Copper Base plate LED back-lit logo design with (4) color inserts (Orange/Green/White/Blue) Provide ideal spacing for standard and rotary fittings G 1/4 thread ports

Package Contents
Package Contents	Pacific W2 CPU Waterblock Universal Mounting Brackets & Hardware (Intel/AMD) (4) Color Plates (Orange/Green/White/Blue) (1) Thermal Paste User Guide

Additional Information
First Listed on Newegg	January 25, 2026

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Item#: 9SIC3X1KS37727