See some pdf documents at the links at the bottom of this page
Old models of these hand pumps used Chevron/Teflon packing seals. Newer (and upgraded) models have Polypak seals.
A variety of seals are available for 2426, 2427 and 2428 pumps.
15 and 20 kpsi pumps use Ruska PN 72-38 that is a Polypak seal, and is Fluke PN 3910853 with description 72-38,SEAL .75 OD X .50 ID. We no longer sell or have stock of this seal. The OEM is Parker Seal and their PN is 12500250V-250B Z4653
40 kpsi pumps use Ruska PN 72-41 that is a Polypak seal and is Fluke PN 3910882 with description (72-41),SEAL .625 OD X .375 ID, POLYPAK. Our service department in Phoenix, Arizona usually has stock. The OEM is Parker Seal and their PN is ?4653-12500-375V-250B
Fluke PN 3872054, but is no longer available as a kit. See below for individual parts and their availability.
The old Ruska PN is 2426-800-40805 with description, KIT, SEAL UPGRADE, FROM PACKING TO POLYPAK
and included these parts,
PN Qty Description
3895973 1 2425-1-5,SPACER SEAL -HAND PUMP (no stock and not sold by Fluke Calibration)
3901773 1 2485-900-033,RING, BACK-UP (1/2 I.D. FOR 20 K PUMP), (stock in Phoenix Service)
3910853 1 72-38,SEAL .75 OD X .50 ID, (no stock and not sold by Fluke Calibration)
Fluke PN 3872101, but is no longer available
is Ruska PN 2427-800-40807
with descripton, KIT, SEAL UPGRADE, FROM PACKING TO POLYPAK
and includes these parts
PN Qty Description
3899551 1 2428-201-003,SEAL SPACER, HAND PUMP 17-4PH (stock in Phoenix service)
3910882 1 72-41,SEAL .625 OD X .375 ID, POLYPAK, 4653-12500-375V-250B (stock in Phoenix service)
Details regarding the comparison of the old versus new 2427 prints.
# 13 (spacer) and # 25 (Polypak seal) in the new print replace # 3 (anti-extrusion ring), 5, 6 and 7 (Teflon packing) in the old drawing. # 8 and # 9 are the same parts.
# 13 is our part number 3899551 with description (2428-201-003),SEAL SPACER, HAND PUMP 17-4PH [ modified 3914046 (800-1092),SS 17-4PH RND 5/8 ER 232 A564-630{17-4PH}H1150 RN].
Here is a photo of old style seals and spacers from a 40000 psi model 2427 hand pump.