Generally speaking, the naming form of low-pressure filter element is as follows:
RF ON 330 D L 10 C 1 . X / 16 - V - B6 .
（1）：RF:Filter Type
RF = Return Line Filter
（2）：ON:Element Media
ON = Optimicron BN/AM = Betamicron/Aquamicron ECON2 = ECOmicron
AM = Aquamicron W/HC = Wire Mesh P/HC = Polyester V = Metal Fiber
（3）：330:Size
30, 60, 110, 160, 240, 330, 660, 950, 1300
（4）：D：Pressure Rating
B = 145 psi (10 bar) (size 30 only)
D = 360 psi (25 bar)
V = 101.5 psi (7 bar) when using following “ VR” indicators: B, BM, E, ES, GC, LE, LZ
（5）：L：Type of Connection
C = 3/4” Threaded (sizes 60, 110 - NPT / BSPP inlet/3/4” SAE Outlet)
E = 1 1/4” Threaded Inlet (SAE/NPT) / 1 1/4” threaded outlet (sizes 160 - 240)
or 2” NPT outlet (size 330)
G = 2” Threaded (size 330 - NPT / BSPP / SAE Inlet / Outlet - same as inlet)
L = 2” SAE 32 Flange Inlet / 2” NPT Outlet (size 330)
M = SAE 48 Flange Inlet / SAE 48 Flange Outlet (size 660)
N = SAE 48 Flange Inlet / 3” NPT Outlet (size 660)
O = SAE 56 Flange (size 950) - Inlet & Outlet
P = SAE 64 Flange (size 1300) - Inlet & Outlet
（6）：10：Filtration Rating (micron)
1, 3, 5, 10, 15, 20 = ON 3, 10 = BN/AM 3, 5, 10, 20 = ECON2 40 = AM
25, 50, 74, 100, 149, 200 = W/HC 10, 20 = P/HC 3, 5, 10, 20 = V
（7）：C：Type of Static or ∆P Clogging Indicator
A, B, BM, C, D, E, LE (Others available upon request)
（8）：1 ：Type Number
1 = Standard Connection
（9）：X
Modification Number (latest version always supplied)
（10）：16：Inlet Port Configuration
0 = BSPP Straight Thread (sizes 30 - 330)
3 = NPT (sizes 30 - 330)
12 = SAE Straight Thread Inlet/Outlet Connections (sizes 60, 110, 160, 240, 330 only)
16 = SAE Flange Code 61 Inlet Connections (sizes 330 - 1300)
（11）：V:Seals
(omit) = Nitrile rubber (NBR) (standard) V = Fluorocarbon elastomer (FKM) EPR = Ethylene propylene rubber (EPR)
（12）：B6：Bypass Valve
B1 = 14.5 psid (1 bar) (lube or coolant) B6 = 87 psid (6 bar) (return line extended life)
B2 = 29 psid (2 bar) KB = No Bypass (flushing systems)
（13）：Supplementary Details
SO263 = Modification of ON and W/HC elements for Skydrol or HYJET phosphate ester fluids
L24, L48, L110, L220 = Lamp for D-type clogging indicator (LXX, XX = voltage)
DE = ∆P Indicator - For in-line applications (sizes 660, 950, 1300)
T = With tank breather (size 30 only)
W = Modification of “V” elements for use with oil water emulsions (HFA) and water polymer solutions (HFC)
SFREE = Element specially designed to minimize electrostatic charge generation
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