How to Read WILDEN Part Numbers and Pump Build Codes

A WILDEN part number looks cryptic, but it follows a fixed pattern. Once you can read it, you can tell the pump size, the type of part and usually the material at a glance, and you can check whether the part you are about to order matches your pump. Everything below is taken from the 2,179 spare parts and kits listed in Wilden’s current range.

The part number: size, part, material

Take 08-1010-58. It splits into three groups:

Group	Example	Meaning
Size code	08	The pump port size the part belongs to
Part code	1010	The type of part
Material suffix	58	What the part is made of

So 08-1010-58 is a 2 inch diaphragm in Santoprene. 08-1080-52 is a 2 inch valve ball in Buna-N, and 04-1120-53 is a 1-1/2 inch valve seat in FKM.

Size codes

Code	Pump port size	Example pumps
00	1/4″	P.025, PS25
01	1/2″	P1, PS1, T1, P100
02	1″	P2, PS2, T2, P200, P220, P230
04	1-1/2″	P4, PS4, T4, P400, P420, P430
08	2″	P8, PS8, T8, P800, P820, P830, H800
15	3″	T15, PS15, P1500, P1520, P1530
20	4″	T20, PS20

Common part codes

• 1010 (also 1020, 1022, 1031, 1040): diaphragms of different designs
• 1060, 1065: back-up diaphragms, used behind PTFE diaphragms
• 1080, 1085: valve balls
• 1120, 1121, 1125, 1128, 1129: valve seats
• 2000, 2003, 2030, 2039: air valve assemblies
• 9804 to 9844: wet end kits
• 9980 to 9994: air repair kits

Material suffixes

Suffix	Material	Suffix	Material
50	Polyurethane	01	Aluminum
51	Neoprene	03	Stainless steel
52	Buna-N	04	Hastelloy
53	FKM	08	Steel
54	EPDM	20	Polypropylene
55	PTFE	21	PVDF
56	Hytrel	57, 58	Santoprene

These hold for nearly all diaphragms, balls and seats on the parts list, but there are exceptions, and some numbers carry a further suffix. For example, 08-1010-55 is the PTFE diaphragm for clamped 2 inch pumps and 08-1010-55-42 the one for bolted pumps. Never drop the extra digits when ordering.

The pump build code

The nameplate on the pump carries a build code such as P8/AAAPP/BNS/BN/BN (part number 08-15034). Read it from left to right:

• P8: the model
• AAAPP: materials; the first letter is the wetted material: A aluminum, S stainless steel, W cast iron, P polypropylene, K PVDF
• BNS: the elastomer code, which also names the matching wet end kit; BNS is Buna-N
• BN / BN: valve ball and valve seat materials
• An optional last group marks a variant; on stainless pumps, /0070 means Tri-Clamp connections

For that P8, the matching parts are the Buna-N diaphragm 08-1010-52, the Buna-N valve ball 08-1080-52, and the wet end kit 08-9804-52, which is listed for clamped metal P8 pumps with the BNS code.

We keep genuine WILDEN spare parts in stock in our warehouse and ship worldwide. Every part we supply is 100% original WILDEN, so once the number is confirmed there is nothing else to cross-reference.

If the nameplate is worn or missing, send us a photo of the pump and any numbers you can read. Every part and kit number can also be searched in our WILDEN spare parts lookup.