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These gaskets incorporate a silicone o-ring to regulate compression in the innermost diameter of the gasket, and also allow for flange and mounting irregularities.  The silicone has a large temperature range where it remains pliable, so it is able to help support the PTFE sleeve in a wide range of services.  The higher durometer non-asbestos filler means the silicone o-ring portion of the gasket will be placed under compression but not flattened completely, allowing it to function as a good base between the valve and piping flanges and the PTFE sleeve. Testing has shown that the silicone o-ring backed version of the gaskets has a higher sealability, and is more forgiving than gaskets with only the standard non-asbestos backing.
Unit of Measure

12/6

Unit
Discount Price / %
12   and up
6%

Package Type

 N/A Each

Units Per Package

 N/A 1

Size

 N/A 4 "

Body Material

 N/A PTFE / N/A Env w/Internal Oring

Vendor Item #

 N/A RGA402TF

Weight

 N/A .15 lb

No. of Holes

 N/A 8

Qty Req'd for Discount

 N/A 12

% Discount at Checkout

 N/A 6 %

N/A To achieve maximum sealing capability, proper installation procedure must be followed. PTFE gaskets require re-torque after initial installation. See maintenance manual MM-FG001.