Your Basket is currently Empty

Go to basket

Elemental Microanalysis News

Browse Products
Browse Products
ICP-MS cones
New CHNSO microanalysis catalogue
Sign up to our Mailing List

How to replace the o-rings on the piston assembly of the Thermo Fisher Scientific® MAS200R autosampler

When the o-rings for the shaft of the MAS 200R autosampler are worn out, they can be very tricky to replace. Elemental can help make this task easier and quicker with their o-ring replacement tool.

Our video shows you how our o-ring replacement tool can help you quickly and easily replace the o-rings on your piston shaft for the MAS 200R autosampler.

The o-ring replacement tool ensures the o-rings slide off and on smoothly, do not catch in the other piston grooves and that the piston shaft is not damaged.

With a differing front and back, the o-rings must face in the correct directions to form the appropriate seals and prevent leakage of gas.

The video and downloadable instructions provide reassurance of o-ring direction throughout the step by step process of using the o-ring replacement tool.


Thermo Fisher Scientific® part no. Description Elemental compatible part no.
343 01512  Piston assembly, MAS 200R F2224
  Tool for replacing o-rings for MAS 200R F2225
290 30343 Green o-rings for shaft of MAS Plus autosampler (Set of three) E6059






These products offer the same high quality and value for money that is typical of Elemental Microanalysis’ entire product range.

If you would like to order these products, reach out to our friendly sales team or register to view our product pricing online.⁠ Elemental Microanalysis has 45 years experience manufacturing and supplying quality products with exceptional service and affordable pricing.

Other Recent Posts
Publish Date: 14/11/2023
Five new caffeine, glucose and gelatin IRMS standards developed by our R&D team have just been released, along with a new fuel analysis standard.
Publish Date: 30/10/2023
Our research and development, quality, product management and manufacturing teams collaboration has enabled Elemental Microanalysis to add these high quality, great value, compatible products to our product range.
Publish Date: 18/10/2023
A new range of compatible products for Elementar® analysers, including the inductar series have been introduced.
ISO 17025:2017 ISO 9001:2015 ISO 17034:2016