Skip to content
Flexfab 5526-062x50, 5/8" ID x 50 ft Box Blue Silicone Heater Hose, 16mm 350F Radiator Coolant

Flexfab 5508-300X12, 3.00" x 12 ft, Wire Reinforced Silicone Coolant Hose, 76mm

by Flexfab
Save 20% Save 20%
$ 15,075.00
$ 15,075.00 - $ 15,075.00
$ 15,075.00
$ 12,060.00
$ 12,060.00 - $ 12,060.00
$ 12,060.00
Request a Quote (Bulk & Dealer Orders)

Quick Specs

BrandFlexfab
Series5508
TypeHose
Body Size3"
Length12 ft

Performance & Construction

Construction Green silicone, 2-ply polyester + helical wire
Inside Diameter 3.00" (76 mm)
Outside Diameter 3.42" (87 mm)
Actual Burst Pressure 300 PSI
Working Pressure ~100 PSI (1/3 of burst)
Temperature Range -65F to +350F
Wall Thickness .130"/.180"
Standards SAE J20 R2 Class A
Origin Made in USA

Product Details

Product Details

The Flexfab 5508-300X12 is a green silicone, 2-ply polyester + helical wire hose engineered for demanding engine environments. It resists hardening, cracking, cold leaks, aging, and many chemicals, making it a durable, long-lasting solution for diesel, automotive, marine, agricultural, and industrial cooling systems.

Why this hose

  • Green silicone, 2-ply polyester + helical wire — durable construction engineered for demanding cooling-system service.
  • -65F to +350F range — stays flexible in cold and handles under-hood heat without hardening or cracking.
  • Resists hardening, cracking, cold leaks, aging, and many chemicals — long service life where ordinary rubber fails.
  • Meets SAE J20 R2 Class A — engineered to recognized heavy-duty hose standards.

Frequently asked questions

Flexfab 5508 Series — Complete Size Chart

Every size in the series. Click a part number to open that product.

Part ID
(in)		 ID
(mm)		 OD
(in)		 OD
(mm)		 Actual
Burst		 SAE TMC Weight
(lb/ft)
5508‑050
5508‑050X12 		0.50" 13 0.92" 23 600 PSI R2 - N/A — 0.17
5508‑062
5508‑062X12 		0.63" 16 1.05" 27 600 PSI R2 - N/A — 0.21
5508‑075
5508‑075X12 		0.75" 19 1.17" 30 600 PSI R2 - N/A — 0.23
5508‑087
5508‑087X12 		0.88" 22 1.30" 33 550 PSI R2 - N/A — 0.26
5508‑100
5508‑100X12 		1.00" 25 1.42" 36 550 PSI R2 - N/A — 0.3
5508‑125
5508‑125X12 		1.25" 32 1.67" 42 525 PSI R2 - N/A — 0.36
5508‑150
5508‑150X12 		1.50" 38 1.92" 49 500 PSI R2 - N/A — 0.43
5508‑175
5508‑175X12 		1.75" 44 2.17" 55 475 PSI R2 - N/A — 0.51
5508‑200
5508‑200X12 		2.00" 51 2.42" 61 450 PSI R2 - N/A — 0.56
5508‑225
5508‑225X12 		2.25" 57 2.67" 68 400 PSI R2 - N/A — 0.65
5508‑250
5508‑250X12 		2.50" 64 2.92" 74 350 PSI R2 - N/A — 0.74
5508‑275
5508‑275X12 		2.75" 70 3.17" 81 325 PSI R2 - N/A — 0.79
5508‑300
5508‑300X12 		3.00" 76 3.42" 87 300 PSI R2 - N/A — 0.85
5508‑350
5508‑350X12 		3.50" 89 3.92" 100 275 PSI R2 - N/A — 1.09
5508‑400
5508‑400X12 		4.00" 102 4.42" 112 250 PSI R2 - N/A — 1.19
5508‑600 6.00" 152 6.42" 163 125 PSI R2 - N/A — 1.84
FLEXFAB

Industrial silicone hose engineered for heater, coolant, and high temperature service. Genuine Flexfab product with correct part numbers and specifications.

Shop All Flexfab

Request a Quote

Bulk and dealer pricing. Tell us what you need and we’ll reply within one business day.