Pay in installments of $2.66 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 31 - Aug 5
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
A31799: Back-Up RingDesigned to provide reliable sealing and support, the Back Up Ring is essential for reducing extrusion in hydraulic systems. Key specifications include an inner diameter of 41. 58 mm (1. 64 in) and an outer diameter of 50. 88 mm (2. 0 in), promoting a precise fit. Features a thickness of 1. 50 mm (0. 06 in) and a radius of 6. 63 mm (0. 26 in) for optimal performance and durability. Made from high quality material for enhanced strength and longevity.
Designed to provide reliable sealing and support, the Back-Up Ring is essential for reducing extrusion in hydraulic systems. Key specifications include an inner diameter of 41.58 mm (1.64 in) and an outer diameter of 50.88 mm (2.0 in), promoting a precise fit. Features a thickness of 1.50 mm (0.06 in) and a radius of 6.63 mm (0.26 in) for optimal performance and durability. Made from high quality material for enhanced strength and longevity.Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 26 reviews
Sort
Product Reviews
★★★★★ 5
Effective,low dose melatonin
Purchased this product again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2026
★★★★★ 3
Three Stars
Will help you sleep.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 8, 2016
★★★★★ 5
Good
The only melatonin that works for me
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 2, 2026
★★★★★ 5
Source Naturals Melatonin is the best!
My husband and I have been using Source Naturals Melatonin for almost 25 years. I have tried a few other brands, and I definitely think Source Naturals is the best! I once saw a program on Discovery channel about how Melatonin is an important heart antioxidant, and that after age 40 the Melatonin in our system goes way down. We had also just moved to a high altitude town, and I was having great difficulty sleeping because of the high altitude. We started taking Source Naturals Melatonin, and I was able to sleep like a baby. I really recommend the time release especially, and we also take a 1 mg sublingual lozenge to fall asleep more quickly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 27, 2017
★★★★★ 5
surprised!
I actually didn't realize I had ordered "time released" version. I thought these were just normal melatonin. But now that I've tried these, I love them so much better than the regular version! Helps me sleep better through the night. No taste, love this brand of Source Naturals.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 17, 2025
recommand products
26 in. x 8 ft. Clear PVC Roof Panel
18.98
5 Gal. Sta-Kool Plus Pro White Roof Coating
75.00
Timbertex Castlewood Gray Double-Layer Hip and Ridge Cap Roofing Shingles (20 lin. ft. per Bundle) (30-pieces)
53.33
Bruce America's Best Choice 3.25-in Gunstock Oak Smooth/Traditional Solid Hardwood Flooring (22-sq ft)
96.56
All Style Retro-Spin Galvanized Steel Roof Flashing for 2.5" (2 7/8" OD) maximum Electric Service Mast Conduit Pipe
41.99