Sub-drill exclusively represents two industry leading and world renowned US based oilfield equipment manufacturers; Global Manufacturing and Keystone Energy Tools.


Global Manufacturing

Global Manufacturing specialise in the design and manufacture of a complete range of Drill Stem Valves, developed and engineered using FEA to be the highest quality and most reliable valve on the market.

Precision machined from the highest quality materials, Global Valves are competitively priced and reliable - designed to last the pace offshore in all types of well and operating conditions, including 20k designs for the next generation of drilling.

Sub-drill are the authorized distributor and OEM approved repair centre for Global Manufacturing products in Europe and Africa.



Sub-drill are the local authorized distributor for Keystone Energy Tools and stock their line of high quality float valves.

Keystone Energy Tools is an API 8C certified manufacturer with over fifty years of combined experience in designing, manufacturing, and delivering high-quality oilfield tools. In addition to providing complete in-house certification .

With years of experience in bridging the gap between quality and service, customers and distributors, and performance and economy, Keystone understands the critical requirements of the oil and gas industry, from on-time delivery to competitive pricing and product availability.

By using the latest in 3D modeling for product design and by staying current with the rapid advances in manufacturing technology and quality-assurance standards, Keystone is able to manufacture and produce the most reliable products on the market today.

Sub-drill valves

drill string valves

global manufacturing drill stem valves

Sub-drill drill stem valves


Additional reading: Drill Stem Valve Services.